All property, real and personal, and credits, claims, and choses in action, belonging to the county of Day at the time of the admission of the State into the Union, shall be vested in and become the property of the County of Ellis: Provided, The Legislature shall provide, by general, special, or local law, for the equitable division of the assets of Day County, thus transferred to Ellis County, and of the liabilities of Day County, between the Counties of Roger Mills and Ellis.