Ala. Const. art. IV, § 90

In the event of the annexation of any foreign territory to this state, the legislature shall enact laws extending to the inhabitants of the acquired territory all the rights and privileges which may be required by the terms of acquisition not inconsistent with this Constitution. Should the state purchase such foreign territory, the legislature, with the approval of the governor, shall be authorized to expend any money in the treasury not otherwise appropriated, and, if necessary, to provide also for the issuance of state bonds, to pay for the purchase of such foreign territory.