Final answer:
During World War II in Papua New Guinea, Manus was the major base for Allied forces due to its strategic location and size.
Explanation:
The major base for Allied forces during World War II in Papua New Guinea was Manus. Manus, part of the Australian-mandated Admiralty Islands, was a crucial strategic location due to its size and location near Papua New Guinea.
Americans needed island-based airfields to counter kamikaze attacks and supply bases for the eventual ground invasion of Japan, making Manus an essential base.
In early 1946, the United States approached Australia for joint-base rights on Manus and the Admiralty Islands, solidifying Manus's importance in the Pacific Theater of World War II.
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