There is appropriated annually, out of funds in the Treasury not otherwise appropriated, for payment to the Commonwealth of Puerto Rico, the Virgin Islands of the United States, Guam, American Samoa, the Commonwealth of the Northern Mariana Islands, the Federated States of Micronesia, the Republic of the Marshall Islands, and the Republic of Palau the amount they would be entitled to receive under this subchapter if they were States. Sums appropriated under this section shall be treated in the same manner and be subject to the same provisions of law, as would be the case if they had been appropriated by the first sentence of section 322 of this title.