Probably circa 1920-1935 ...postally unused.Yap was a major German naval communications center before the First World War. It was occupied by Japanese troops in September, 1914, and passed to the Japanese under the Versailles Treaty in 1919.
In World War II, Japanese-held Yap was one of the islands bypassed in the U.S. "island-hopping" strategy, although it was regularly bombed by U.S. ships and aircraft, and Yap-based Japanese bombers did some damage in return.
At the end of World War II, Yap was occupied by the U.S. military victors. The U.S. held it and the rest of the Caroline Islands as a trusteeship under a United Nations mandate (the "Trust Territory of the Pacific Islands") until 1986. In that year, Yap, Truk, Pohnpei, and Kosrae formed the independent nation of the Federated States of Micronesia. Under a Compact of Free Association with the United States, Micronesian citizens and goods are allowed entry into the U.S. with few restrictions.
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