. . . . "Act July 25, 1947, ch. 327, ??3, 61 Stat. 451, provided that in the interpretation of the provisions of this section, which authorized the President to acquire, through construction or conversion, ships, landing craft, and other vessels, the date July 25, 1947, shall be deemed to be the date of termination of any state of war theretofore declared by Congress and of the national emergencies proclai" .