Gilbert and Marshall Islands campaign
During World War II, the United States took control of the islands from Japan (which governed them as part of the South Seas Mandate) in the 1944 Gilbert and Marshall Islands campaign. The US military conducted nuclear testing on Bikini Atoll in 1946 through 1958. In 1965, the US government formed the Congress of Micronesia, a plan for increased self-governance of Pacific islands. The Trust Territory of the Pacific Islands in 1979 provided independence to the Marshall Islands, whose constitution and president were formally recognized by the US.