With San Francisco Peace Treaty signed on Septemter 8, 1951, the Senkaku Islands were placed under the US Administration.
1960's map by U.S.A.
you can view the Senkaku by zooming the map:
1952: http://www.nationalgeographic-maps.c...-east-map.html
1964: http://www.nationalgeographic-maps.c...china-map.html
1971: http://www.nationalgeographic-maps.c...-asia-map.html
1960's by U.S.A.
1960's by U.S.A.