; and (2) the annual block grants shall decrease thereafter on a straight-line basis, at the rate of ten percent each year, beginning on the eleventh fiscal year after the proclamation of international sovereignty through free association. At any time during the aforementioned transition period the terms of this subsection may be modified by agreement between the United States and the nation of Puerto Rico. (d) Revision The terms and conditions of this subsection may be revised as part of an agreement under the Articles of Free Association. III Transition and Implementation—Statehood 301. Presidential proclamation; admission into the Union If a plebiscite held under this Act results in a majority vote for statehood: (1) Presidential proclamation