Was Guam occupied Japan?
Keeping this in consideration, why did Japan invade Guam?
The outbreak of the Pacific War began with Japan's attack on Pearl Harbor on 8 December (December 7 in Hawai'i) 1941 with a subsequent air attack on US military facilities on Guam. McMillin, Governor of Guam, surrendered at 5:45 a.m. and signed a letter of surrender at 6 a.m. on the same day.
Simply so, when was Guam liberated from the Japanese?
The Second Battle of Guam (21 July – 10 August 1944) was the American recapture of the Japanese-held island of Guam, a U.S. territory in the Mariana Islands captured by the Japanese from the U.S. in the 1941 First Battle of Guam during the Pacific campaign of World War II.
On June 21, 1898, the United States captured Guam in a bloodless landing during the Spanish–American War. By the Treaty of Paris, Spain officially ceded the island to the United States.