US Naval Base New Guinea was number of United States Navy bases on the Island of New Guinea (Papua New Guinea, Dutch New Guinea and British New Guinea) during World War II. Australia entered World War II on 3 September 1939, being a self-governing nation within the British Empire. The United States formally entered the war on 7 December 1941, following the Empire of Japan bombing of Pearl Harbor. Following the attack on Pearl Harbor Japan quickly took over much of the South Pacific. The United States lost key Naval Bases in the South Pacific including: Naval Base Manila and Naval Base Subic Bay lost in the 1941 invasion of the Philippines. Also lost was Naval Base Guam and Wake Atoll. As such the United States Armed Forces needed new bases in the South West Pacific for staging attacks on Japan's southern empire, the United States built bases first in Australia, then in New Guinea.
