Kiribati
During World War II, Japan took the islands. During the Cold War, the US tested nuclear weapons there. In 1979, Kiribati became independent. Kiribati signed a "Treaty of Friendship and Territorial Sovereignty" (also called the "Treaty of Tarawa") with the United States in 1979.  The USA gave up its claims to the islands of Canton, Enderbury, Hull, Birnie, Gardner, Phoenix, Sydney, McKean, Christmas, Caroline, Starbuck, Malden, Flint, and Vostok in that treaty.