Defendant-appellant Imauri Ivery (“Iv-ery”) pleaded guilty to one count of possession of a firearm by a convicted felon in violation of 18 U.S.C. § 922(g)(1) and was sentenced to 180 months in prison under the Armed Career Criminal Act (“ACCA”), 18 U.S.C. § 924(e). The plea was conditioned on Ivery’s retention of the right to appeal the denial of his motion to suppress a firearm and ammunition police recovered while searching Ivery’s vehicle during a traffic stop. Fed.R.Crim.P. 11(a)(2) (2005). In addition to appealing the denial of the motion to suppress, Ivery challenges the district court’s enhancement of his sentence under the ACCA. We affirm.
I.
The primary question here goes to the scope of permissible police authority under
Terry v. Ohio,
The facts found by the district court are as follows: Around 6:00 AM on August 11, 2002, Boston city police officer Grant Cal-lender was on duty in Boston’s Chinatown, an area known for drug-related crime, when he observed Ivery driving a white Mercedes with no front license plate and a partially detached rear license plate. Cal-lender pulled Ivery over two blocks later, where he was joined by officer Kevin Er-vin. While approaching Ivery’s vehicle (Callender from the rear and Ervin from the front), the officers noticed that Ivery *71 was leaning to the right; that Ivery’s glove compartment was open, revealing “a box of ... plastic sandwich bags sticking out from the glove box[;]”; and that both front seats of Ivery’s car were fully reclined, obscuring the car’s rear floorboard.
Still standing near the Mercedes with Ivery inside, Ervin told Callender that he recognized Ivery as a person who had previously fled from police. Hearing this, Ivery interjected “I don’t run from the police” in a “quivering” voice. Both officers said that Ivery appeared nervous; Callender noted that Ivery was “actually shaking ... his hands were shaking.” After this verbal exchange, Callender instructed Ivery to exit the car, frisked him, found nothing, and then directed Ivery to the rear of the car where Ervin was standing. Callender next “frisked” the inside of the Mercedes, searching the front and rear compartments, floorboards, and Anally behind an armrest in the center of the rear seat-back, where he found a loaded pistol. When Callender emerged, Ivery unsuccessfully attempted to flee and was placed under arrest.
On December 4, 2002, Ivery was indicted in one count for unlawful possession of a firearm and ammunition by a person previously convicted of a crime punishable by imprisonment for one year or more in violation of 18 U.S.C. § 922(g)(1). Ivery moved to suppress the pistol and ammunition on Fourth Amendment grounds, arguing that they were obtained through an illegal search of the Mercedes. After an evidentiary hearing, the district court denied Ivery’s motion.
Relying on the officers’ observations of the character of the neighborhood, Ivery’s nervousness, his possession of the suspicious plastic bags, and his concealment of the car’s rear floorboard, the district court concluded that the officers’ search was permissible under Terry, based on their “observations of the vehicle [and of] Mr. Ivery.”
While the district court credited Ervin’s testimony that he recognized Ivery as someone who had previously run from police, the district court did not rely on this testimony. The district court neither credited nor relied on Ervin’s testimony that during the traffic stop officer Chris Hamilton informed Ervin by telephone that “there was a white Mercedes that frequents ... the Chinatown area” whose driver “had assaulted an officer.” Ivery entered a conditional guilty plea to the sole count in the indictment on July 2, 2003.
Ivery stipulated at sentencing that he had three earlier convictions for “serious drug offense[s]” within the meaning of 18 U.S.C. § 924(e). This led the district court to calculate Ivery’s sentence under the ACCA. The district court sentenced Ivery to 180 months in prison (the minimum sentence required by the ACCA), followed by 60 months of supervised release, and imposed a $100 statutory assessment. Though the district court made a calculation of Ivery’s sentence pursuant to the federal Sentencing Guidelines, ultimately the length of Ivery’s sentence was determined by application of the ACCA, not the federal Sentencing Guidelines. Thus there was no
Booker
error.
See United States v. Booker,
543 U.S. -,
II.
In
Terry,
the Supreme Court held that police “may in appropriate circumstances and in an appropriate manner approach a person for purposes of investí-
*72
gating possibly criminal behavior even though there is no probable cause to make an arrest.”
Terry,
In
United States v. Lott,
we held that the second part of the
Terry
test imposes a dual requirement for a permissible war-rantless search for weapons: (1) the officers must have actually harbored a suspicion that the suspect was armed; and (2) that suspicion must have been reasonable under the circumstances.
See Lott,
Whether the officers actually feared for their safety is a question of fact. On appeal from disposition of a motion to suppress, we review the district court’s findings of fact only for clear error.
United States v. Pardue,
The district court also concluded, as indicated by its reference to
Terry,
that Callender’s and Ervin’s suspicions were reasonable under the circumstances. Iv-ery challenges this conclusion as well. The district court’s reasonableness determination is a decision of law based on factual findings. We review the legal determination of reasonableness de novo.
Pardue,
The district court relied on four features of the situation at the time of the search to conclude that the officers’ suspicion was reasonable: (1) Ivery’s presence in a high-crime neighborhood; (2) Ivery’s nervousness; (3) Ivery’s concealment of the car’s rear floorboard; and (4) Ivery’s possession of objects suggesting illegal conduct. We have previously found circumstances similar to each of these features relevant to determining reasonable suspicion.
See, e.g., Trullo,
Though Ivery is correct that any one of these features, standing alone, may be insufficient to support reasonable suspicion, we have repeatedly held that when evaluating the validity of a
Terry
stop, we “must consider all of the relevant circumstances ... which ‘are not to be dissected and viewed singly; rather they must be considered as a whole.’ ”
Gilliard,
The only authority that comes close to supporting Ivery’s position is
Trullo,
in which we observed that our finding of reasonable suspicion “represent[ed] the outermost reach of a permissible
Terry
stop.”
Trullo,
Viewing the totality of the circumstances from the perspective of experienced police officers, we conclude that Callender and Ervin had a reasonable basis for suspecting that Ivery might be armed, and thus that their search of Ivery’s car was valid under Terry.
III.
We next address Ivery’s Sixth Amendment challenge to the district court’s use of Ivery’s prior convictions to enhance his sentence under the ACCA. The ACCA enhances the sentence for a violation of 18 U.S.C. § 922(g)(1) to a minimum 15-year term of imprisonment when the defendant has “three previous convictions ... for a violent felony or a serious drug offense, or both, committed on occasions different from one another....” 18 U.S.C. § 924(e)(1) (2000). At sentencing before the district court, Ivery stipulated to three prior convictions sufficient to require a minimum 15 year prison term under the ACCA.
On appeal, Ivery argues for the first time that the government’s failure to prove the facts of his prior convictions to a jury beyond a reasonable doubt violated his Sixth Amendment rights. The question here is whether the district court erred in relying on Ivery’s stipulations, rather than a jury finding, to establish the existence of the prior convictions for ACCA purposes. Ivery did not present his Sixth Amendment argument to the district court. Thus, we review the district court’s sentencing determination for plain error.
United States v. Colon-Munoz,
Ivery relies on
Apprendi v. New Jersey,
Blakely
relied on
Apprendi
to invalidate a state statutory sentencing scheme and reasserted Apprendi’s admonition that the Sixth Amendment requires proof to a jury of all facts affecting punishment “other than the fact of a prior conviction.” 542 U.S. at -,
The Supreme Court addressed the scope of the prior conviction exception in
Shepard v. United States,
— U.S. -,
Ivery insists, relying on Justice Thomas’s concurrence in
Shepard,
that
Almen-darez-Torres
is inconsistent with
Apprendi
and
Booker. See Shepard,
—— U.S. at -,
Affirmed.
Notes
. Ivery makes a related claim—that the officers' professed safety concerns were based solely on the discredited testimony about the phone call from Hamilton. We disagree. Both Callender and Ervin clearly testified that their suspicions were provoked primarily by their observations of Iveiy.
. In
Whren,
the Supreme Court concluded that precedent ''foreclose[s] any argument that the constitutional reasonableness of traffic stops depends on the actual motivations of the individual officers involved.”
Whren,
