48 U.S.C. § 731c

Sections 731b to 731e of this title shall be submitted to the qualified voters of Puerto Rico for acceptance or rejection through an island-wide referendum to be held in accordance with the laws of Puerto Rico. Upon the approval of said sections, by a majority of the voters participating in such referendum, the Legislature of Puerto Rico is authorized to call a constitutional convention to draft a constitution for the said island of Puerto Rico. The said constitution shall provide a republican form of government and shall include a bill of rights.