. The main opponents in World War II were the . The United States entered the war on the side of the after the bombing of by

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Answer:

The main opponents of the World War were The Axis, which was formed by Germany, Italy, and the Empire of Japan and the Allies, which was initially formed by Great Britain and France.

The United States entered the side of the Allies.

The Bombing of Pearl Harbor on December 7th, 1941.

The Navy of the Empire of Japan.

The Naval Base of Pearl Harbor in Hawaii.

Explanation: