Which event forced the United States to abandon the policy of isolationism and become involved in World War II? A) Japan's attack on Pearl Harbor B) Germany's treatment of the Jewish people C) attacks by the Italians on New York City D) unrestricted German submarine warfare

The correct answer is letter A

Explanation: The United States represented an obstacle to Japanese expansion in the Pacific Ocean. Therefore, the Japanese military decided to attack Pearl Harbor, which was the main American naval base in the Pacific. But this event ended up making the US entering the war.