For the purpose of Federal income, estate, and gift taxes, any gift, devise, or bequest to or for the use of the Commission , and accepted by the Commission under authority of this chapter, shall be deemed to be a gift, devise, or bequest to or for the use of the United States, as the case may be, if it is not deducted as a gift, devise, or bequest to or for the use of the Government of Canada under the income, estate, or gift tax laws of the Government of Canada. ( Pub. L. 88–363, § 13 , July 7, 1964 , 78 Stat. 301 .)