Celia Aleman (“Aleman”), a 62-year-old permanent resident alien, appeals the district court’s dismissal of her action challenging a provision of the Personal Responsibility and Work Opportunity Reconciliation Act of 1996, Pub.L. No. 104-193, 110 Stat. 2105 (1996) (the ‘Welfare Reform Act” or the “Act”), the application of which denied her food stamps from September of 1997 to November 1, 1998. We conclude that, in determining a permanent resident alien’s eligibility for food stamps, the provision at issue, now codified at 8 U.S.C. §§ 1612(a)(2)(B) and 1645, does not irrationally differentiate between marriages that end in divorce and those that end in death. We therefore hold that the challenged provision does not violate the equal protection component of the Due Process Clause of the Fifth Amendment, and we accordingly affirm.
I.
The Food Stamp Act of 1964, 7 U.S.C. § 2011 et seq., established a state-adminis *1194 tered, federal program to supplement the food purchasing power of low-income households. See id. § 2011. Eligibility for participation in the program is determined on a household rather than an individual basis, see id. § 2014; 7 C.F.R. § 273.1, and the program is restricted to households with net incomes below the federal poverty level and resources below $2,000 or, if a household member is disabled or age 60 or older, below $3,000, see 7 U.S.C. § 2014(c); 7 C.F.R. § 273.8; 7 C.F.R. § 273.9. Once eligible, households receive coupons that may then be used to purchase food from approved retail stores. See 7 U.S.C. § 2013(a).
The Welfare Reform Act significantly restricted the eligibility of permanent resident aliens to receive food stamps. In particular, the Act provides that, subject to certain enumerated exceptions, a “qualified alien” is ineligible for food stamps, 8 U.S.C. § 1612(a)(1), and it defines “qualified alien” to include “an alien who is lawfully admitted for permanent residence,” id. § 1641(b)(1).
At issue in this case is the exception to this general prohibition now codified at 8 U.S.C. § 1612(a)(2)(B) (the “qualifying-quarters provision”). This exception provides that food stamps remain available to a qualified alien who “is lawfully admitted to the United States for permanent residence” and who “has worked 40 qualifying quarters of coverage as defined under Title II of the Social Security Act ... or can be credited with such quarters under [8 U.S.C. § 1645].” Id. § 1612(a)(2)(B). 1 Under 8 U.S.C. § 1645, “an alien shall be credited with-(l) all of the qualifying quarters of coverage ... worked by a parent of such alien before the date on which the alien attains age 18, and (2) all of the qualifying quarters worked by a spouse of such alien during their marriage and the alien remains married to such spouse or such spouse is deceased.” Id. § 1645. However, “[n]o such qualifying quarter of coverage ... may be credited to an alien ... if the parent or spouse (as the case may be) of such alien received any Federal means-tested public benefit ... during the period for which such qualifying quarter of coverage is credited.” Id. 2
Before the enactment of the Welfare Reform Act, Aleman received food stamps as the sole member of her eligible household. As “an alien who is lawfully admitted for permanent residence,” however, Aleman is a “qualified alien” under the Act, and because she could not invoke any of the statutory exceptions, the Arizona Department of Economic Security (the “ADES”) terminated Aleman’s certification for food stamps beginning in September of 1997.
In determining that Aleman no longer qualified for food stamps, the -ADES noted that she could not invoke the qualifying-quarters provision. That is, although Ale-man was married to Cosme Aleman (“Cosme”) from June 6, 1956, to May 8, 1975, and although Cosme worked 40 qualifying quarters during their marriage, the marriage ended in divorce. Thus, Aleman could not be credited with Cosme’s quarters under 8 U.S.C. § 1645. Neither could she qualify for food stamps through her parents, who had not worked in covered employment in the United States before Aleman reached the age of 18. Consequently, Aleman, who had not worked 40 qualifying quarters herself, did not retain her eligibility for food stamps under 8 U.S.C. § 1612(a)(2)(B).
*1195 On January 16, 1998, Aleman filed a complaint in the United States District Court for the District of Arizona against U.S. Secretary of Agriculture Daniel Glickman, in his official capacity (“Secretary Glickman” or “government”), challenging the termination of her food stamps. She asserted that, in determining eligibility for food stamps, the qualifying-quarters provision of the Welfare Reform Act irrationally distinguishes between two otherwise identical classes of lawful residents: (1) “[t]he disadvantaged class, of which plaintiff is a member, all of whom are completely denied necessary credit for quarters of covered employment worked by former spouses during marriages that ended in divorce”; and (2) “[t]he favored class, all of whom are [granted] full credit for documented quarters of covered employment worked by former spouses, during marriages that ended in their deaths.” Aleman argued that this classification system violates the equal protection component of the Due Process Clause of the Fifth Amendment, and she prayed for declaratory and injunctive relief.
Five months after Aleman filed her complaint, the President signed into law the Agricultural Research, Extension
&
Education Reform Act of 1998, Pub.L. No. 105-185, §§ 503-508, 112 Stat. 523 (1998), (the “1998 amendments”). This statute restored food-stamp eligibility for, inter alia, “[disabled aliens lawfully residing in the United States on August 22, 1996.” 8 U.S.C. 1612(a)(2)(4). Because she meets the statutory definition of “disabled,” Ale-man satisfied this provision, and, on November 1, 1998, the effective date of the 1998 amendments, she regained her eligibility for food stamps. Thus, after this date, Aleman’s claims for prospective relief became moot, and her only remaining claim was for a retroactive award of food stamps for the period during which her benefits were cut off, from September of 1997 to November 1, 1998.
See Yang v. California Dep’t of Soc. Servs.,
Secretary Glickman moved to dismiss Aleman’s complaint under Federal Rule of Civil Procedure 12(b)(6). The government argued that Aleman could not state an equal protection violation because the qualifying-quarters provision is supported by a rational basis.
On August 7, 1998, the district court granted the government’s motion. Consistent with Aleman’s allegations, the district court stated that the statutory classification at issue was “between those marriages ending in divorce and those ending in death.” Because it determined that “no fundamental right or suspect classification [was] involved,” and because it found that the challenged statute involved “Congresses] plenary power to regulate immigration and naturalization,” the district court reviewed this classification under the rational basis test. Applying this standard, it found “the provision [to be] rationally related to the legitimate 1 interests of promoting self-sufficiency within a household, minimizing the welfare dollars spent on non-citizens, and discouraging divorce.” Accordingly, the district court held that 8 U.S.C. §§ 1612(a)(2)(B) and 1645 did not violate the equal protection component of the Due Process Clause of the Fifth Amendment, and it therefore dismissed Aleman’s complaint under Rule 12(b)(6). This appeal followed.
II.
In resolving Aleman’s equal protection challenge, we must first determine what classification has been created by the qualifying-quarters provision.
See Attorney General of New York v. Soto-Lopez,
The qualifying-quarters provision allows a permanent resident alien whose spouse has worked 40 qualifying quarters “during their marriage and the alien remains married to such spouse or such spouse is deceased,” 8 U.S.C. § 1645, to remain eligible for food stamps. See id. § 1612(a)(2)(B). In interpreting this language, we hold, as did the district court, that the relevant statutory classification is between (1) those legal aliens, like Aleman, whose spouse had worked 40 qualifying quarters during a marriage that ended in divorce, and (2) those legal aliens whose spouse had worked 40 qualifying quarters during a marriage that ended in death. Under the Welfare Reform Act, this second group of aliens (the widowed spouses) is eligible for food stamps, but the first group (the divorced spouses) is not.
In her brief, 3 Aleman takes issue with this classification, arguing that “[t]he fact of [a worker-spouse’s] death is wholly sufficient, under [8 U.S.C. § 1645], to entitle [a permanent resident alien] to credit for [the worker-spouse’s] quarters of covered employment during their marriage- regardless of whether or not the marriage itself ended with the worker’s death.’’ In other words, as Aleman’s brief urges, the relevant statutory classification created by the qualifying-quarters provision is actually between (1) those legal aliens (who are ineligible for food stamps and who include Aleman) whose spouses worked 40 qualifying quarters during marriages that ended in divorce and whose now ex-spouses are still alive, and (2) those legal aliens (who are eligible for food stamps) whose spouses worked 40 qualifying quarters during marriages that ended in divorce and whose now ex-spouses are deceased.
We reject this interpretation because it conflicts with an Act of Congress, with the Department of Agriculture’s formal regulations implementing the food-stamp program, and with the Department’s informal guidelines on the qualifying-quarters provision. In specific, 1 U.S.C. § 7 provides that “[i]n determining the meaning of any Act of Congress, ... the word ‘spouse’ refers only to a person of the opposite sex who
is
a husband or a wife.” 1 U.S.C. § 7 (emphasis added). Similarly, in 7 C.F.R. § 271.2, the Department of Agriculture defines “spouse” in the present tense for the purposes of the food-stamp program.
See
7 C.F.R. § 271.2;
see also Christensen v. Harris County,
— U.S. -, -,
Moreover, in guidelines sent to the states, the Department of Agriculture has expressly rejected the interpretation that Aleman proposes in her brief. It has instead interpreted the qualifying-quarters
*1197
provision to mean that “[a] former spouse’s quarters cannot be credited if the marriage ended, unless by death.” Food & Nutrition Serv., U.S. Dep’t of Agric.,
Cumulative Questions and Answers on Certification and Work Issues in PRWORA
(current as of July 1999) [hereinafter USDA Guidelines].
4
Although this agency enforcement guideline “do[es] not warrant Chevron-style deference,”
Christensen
, — U.S. at-,
We conclude that the relevant statutory classification here presented is between (1) those permanent resident aliens whose spouse had worked 40 qualifying quarters during a marriage that ended in divorce, and who were therefore ineligible for food stamps, and (2) those permanent resident aliens whose spouse had worked 40 qualifying quarters during a marriage that ended in death, and who were therefore eligible for food stamps.
III.
Having resolved the preliminary issue of statutory interpretation, we must next ascertain the appropriate level of scrutiny to employ in evaluating Aleman’s equal protection challenge. Because the federal statutory classification at issue in this case discriminates among aliens in the distribution of welfare benefits, we find that the Supreme Court’s decision in
Mathews v. Diaz,
In
Diaz,
the Supreme Court upheld the constitutionality of a provision of the Social Security Act that restricted aliens’ eligibility for the Medicare Part B medical-insurance program based on their continuous residence in the United States for five years and their admission to the country for permanent residence.
See Diaz,
When previously faced with a federal classification among aliens in the distribution of welfare benefits, we found
Diaz
dispositive as to the appropriate level of judicial review.
See Sudomir,
Despite this authority, Aleman presents several arguments why the standard of review articulated in Diaz should not apply. We reject each in turn.
First, Aleman contends that unlike in
Diaz,
where the classification among aliens “served the indispensable objective of identifying [permanent resident aliens] whose ties to the United States ... were sufficiently like those of citizens,” in this case, “affinity with the United States ... is not even remotely an issue.” This argument, however, “fails to address the relevant issue.”
Rodriguez,
Relying on the Supreme Court’s decisions in
Plyler v. Doe,
Furthermore, Aleman asserts that although Diaz’s rational basis test applies to statutes enacted under Congress’s plenary power over immigration and naturalization,
Diaz
does not establish the appropriate level of scrutiny for the qualifying-quarters provision, which is “unrelated to any incident of alienage.”
Accord
1 Laurence H. Tribe,
American Constitutional Law,
§ 5-18, at 975 (3d ed. 2000) (“Outside the context of entry, stay, and naturalization, congressional authority to regulate the activities of aliens, and to draw fines both between aliens and citizens and among aliens in the distribution of benefits, loses its clear connection to considerations of national sovereignty and foreign policy; outside those limited contexts courts should thus feel freer to limit congressional power .... ” (footnote omitted)). Although this argument may have some logical merit, it is foreclosed by
Diaz. See Kiev,
Finally, Aleman argues that the qualifying-quarters provision infringes upon the fundamental right to marry and is therefore subject to strict scrutiny analysis.
See Zablocki v. Redhail,
We need not decide whether Diaz’s rational basis test would control in a case in which the statutory classification actually infringed upon an alien’s fundamental right to marry, however, because the qualifying-quarters provision does not “interfere directly and substantially with the right to marry.”
Id.
at 387,
Thus, in all relevant respects, Diaz is indistinguishable from the present ease. Because Diaz sets forth the applicable standard of review, we now examine whether the classification created by the qualifying-quarters provision is supported by a rational basis.
IV.
“[R]ational-basis review in equal protection analysis ‘is not a license for courts to judge the wisdom, fairness, or logic of legislative choices.’ ”
Heller v. Doe,
To reiterate, the relevant statutory classification in this case is between (1) those permanent resident aliens, like Ale-man, whose spouse had worked 40 qualifying quarters during a marriage that ended in divorce, and who were therefore ineligible for food stamps and (2) those permanent resident aliens whose spouse had worked 40 qualifying quarters during a marriage that ended in death, and who were therefore eligible for food stamps. Although this classification is not a model of legislative logic and, as in this case, can operate quite harshly to deprive deserving persons of the means of subsistence, we are compelled to conclude that it survives the exceedingly low level of judicial scrutiny mandated by the rational basis test.
A.
Although neither circuit confronted the particular classification at issue in this case, both the Seventh and Eleventh Circuits have found a rational basis for 8 U.S.C. § 1612(a)(2)(B).
See City of Chicago v. Shalala,
The Supreme Court has twice addressed statutory classifications that, like the classification at issue in this case, discriminate against divorcees in the allocation of federal benefits. On both occasions, the Court held that these classifications in the context of the Social Security Act survived the rational basis standard of review.
First, in
Mathews v. de Castro,
Aleman attempts to distinguish
de Castro
and
Owens.
She points out that “[u]n-like the Social Security Act, the Food Stamp Act is, at bottom, exclusively concerned with the urgent want of program beneficiaries.” Indeed, the
de Castro
Court itself stated that the aspects of the Social Security system it was addressing “do not purport to be general public assistance laws that simply pay money to those who need it most.”
De Castro,
Despite Aleman’s arguments, however, the qualifying-quarters provision, as opposed to the food-stamp program generally, is not strictly a need-based program. Rather, it, in relevant part, grants food-stamp eligibility to one spouse based on the past efforts of the other spouse. In this regard, the qualifying-quarters provision is essentially indistinguishable from the statutes at issue in
de Castro
and
Owens.
To be more precise, both
de Castro
and
Owens
dealt with insurance programs and the question whether a divorcee was entitled to benefits earned by the past work of an ex-spouse.
See Owens,
In sum, we agree with the Seventh and Eleventh Circuits that Congress could rationally enact the qualifying-quarters provision as a reward to a legal alien for his past work in this country. Moreover, as the Supreme Court held in de Castro and Owens, Congress could rationally assume that divorced spouses depend less on a wage-earning ex-spouse than widowed spouses depend on a deceased spouse. Therefore, it was not “wholly irrational” for Congress to deny the reward of food stamp eligibility to divorcees, like Aleman, who have a separate financial and legal existence from those the reward is supposed to benefit, the spouse who has worked the 40 quarters. 7
*1203 B.
We also conclude the qualifying-quarters provision is rationally related to the legitimate governmental purpose of limiting expenditures on public-benefit programs.
In
Diaz,
the Supreme Court found that “maintaining ... fiscal integrity” was a legitimate purpose for Congress to pursue in limiting the number of aliens eligible for Medicare benefits.
Diaz,
Providing food stamps to widowed aliens but not to divorced aliens serves this cost-saving end. That is, under the qualifying-quarters provision, when a marriage ends in death, only one household, the surviving spouse’s, remains eligible for food stamps. Similarly, when a marriage ends in divorce, only one household, the worker-spouse’s, retains food-stamp eligibility. Specifically, under the food-stamp program, one 2-person household can receive a maximum monthly benefit of $234.00, whereas two 1-person households can receive a combined maximum monthly benefit of $254.00. See Food & Nutrition Serv., U.S. Dep’t of Agriculture, Allotment Chart (effective from Oct. 1999 to Sept. 30, 2000). 8 Congress thus took the legitimate approach of tracking the qualifying-quarter-earner’s household to avoid duplicate expenditure of resources, including administrative costs. If the government departed from this approach and allowed divorcees like Aleman to keep their food-stamp eligibility, it would double the number of potentially eligible households and thereby increase the cost of the program. Therefore, all else being equal, limiting the number of households potentially eligible for food stamps, which the qualifying quarters provision does, conserves government resources. See id.
“[T]he mere fact that a classification saves money because it does not extend benefits to some people, by itself, does not demonstrate the classification’s rationality.”
Sims,
V.
For the foregoing reasons, we hold that the statutory classification at issue does not violate the equal protection component of the Due Process Clause of the Fifth Amendment, and, accordingly, the district court’s dismissal under Federal Rule of Civil Procedure 12(b)(6) is AFFIRMED.
Notes
. Forty qualifying quarters is equivalent to ten years. See 42 U.S.C. § 413.
. The programs included under the term "Federal means-tested public benefit” are listed at 8 U.S.C. § 1613(c)(2). In the legislative history of the Welfare Reform Act, "Federal means-tested public benefit” is defined as "a public benefit (including cash, medical, housing, and food assistance and social services) of the Federal Government in which the eligibility of an individual, household, or family eligibility unit for benefits, or the amount of such benefits, or both are determined on the basis of income, resources, or financial need of the individual, household, or unit.” H.R. Conf. Rep. No. 104-725, at 381 (1996), reprinted in 1996 U.S.C.C.A.N. 2649, 2769 (internal quotation marks omitted).
. At oral argument, Aleman's counsel accepted the district court’s (and the government's) interpretation of the qualifying-quarters provision "for the purposes of this argument.” We must look beyond this concession, however. "[W]hen an issue or claim is properly before the court, the court is not limited to the particular legal theories advanced by the parties, but rather retains the independent power to identify and apply the proper construction of governing law.”,
United States Nat'l Bank v. Independent Ins. Agents of Am., Inc.,
. These guidelines are available at http://www.fns.usda.gov/fsp/menu/admin/wel-fare/sect.ion402.him.
. In
Moving Phones Partnership L.P. v. FCC,
. There is, of course, one obvious difference between
de Castro
and
Owens
and the present case. Unlike the legislation at issue in
de Castro
and
Owens,
the qualifying-quarters provision discriminates on the basis of alien-age. That is, all else being equal, if Aleman were a United States citizen, she would qualify for food stamps. This difference does not affect the outcome of Aleman's case, however.
See Diaz,
. Aleman points out in her brief that a legal alien over the age of 18 can claim credit for quarters worked by his parents before the alien reached age 18, even if the now-adult alien leads a life completely independent of his parents.
See
USDA Guidelines,
supra
(noting that "an alien of any age” can claim credit for his parent's quarters before the alien reaches age 18). However, we do not find it “wholly irrational” for Congress to believe that, as a class, children of any age are more dependent on their parents than divorcees are on their ex-spouses.
See Beach Communications,
. This information, listing the maximum monthly allotments that households of various sizes may receive under the food-stamp program, is available at http://www.fhs.usda.gov/fsp/charts/allotmentc-hart.htm
. As a practical matter, under the qualifying-quarters provision, more than one household could gain food-stamp eligibility from the work of one alien. For example, if a husband and wife live in separate households, the government concedes that both households could be eligible for food stamps. However, as the Supreme Court has repeatedly made clear, "courts are compelled under rational-basis review to accept a legislature’s generalizations even when there is an imperfect fit between means and ends.”
Heller,
. The district court also held that the qualifying-quarters provision was rationally related to the legitimate purpose of "discouraging divorce.” The government does not raise this argument on appeal, and we do not rely on “discouraging divorce” as a rational basis. Because one has a fundamental right to marry,
seeZablocki,
