In addition to Pearl Harbor, Japan attacked many islands in the Philippines, which the United States was defending under Allied command. Thus. the correct answer is A.
The US Pacific Fleet was destroyed when Japan launched a surprise attack on Pearl Harbor on December 7, 1941. When Germany and Italy announced war on the United States, America found itself in the middle of a worldwide conflict.
In addition to Pearl Harbor, Japan attacked other islands in the Philippines, which the US was defending under the leadership of an Allied commander.
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