'Angry Days' Shows An America Torn Over Entering World War II World War II is often thought of as a good and just war — a war the U.S. had to fight. Rankin’s December 8, 1941 vote also made her the only member of Congress to vote against the U.S. joining both World Wars, writes History.com.Add those on to … A series of neutrality acts in 1935, 1936, and 1937 was designed to prevent the United States from being drawn into European conflicts. The Sudden Japanese Attack At Pearl Harbor. In fact, many Americans viewed World War II as a European problem and did not necessarily see America as having a large role to play. 3 Main Reasons Why Did The US Enter World War 2. Entering the war was a very complex decision but the main reason was that it would greatly increase the U.S. geopolitical power. When events began happening in Europe that would eventually lead to World War II, many Americans took an increasingly hard line toward getting involved. Franklin D. Roosevelt Politically, the United States struggled with the question of joining the war before it did. The USA entered World War II in response to the Japanese bombing of the American naval base at Pearl Harbor, Hawaii. While it is true that American forces played a key role in the victories, what has to first be acknowledged is that America won two wars. In 1941 on the month of December 7th, the Empire of Japan did an operation in America’s Pearl Harbor Island. Prior to the attack, the country had maintained an isolationist policy, although government leaders considered involvement inevitable and had been providing the Allies with arms and other supplies. We were concerned about preserving our way of life but little did we know that the greatest threat to the American way of life lie in the continent we so casually regarded. The United States entered World War II after the Japanese Navy attacked the U.S. naval base at Pearl Harbor on December 7, 1941. World War II – Why America Won The suggestion that America won World War 2 has several flaws, though from an American perspective this is the reality. America wrapped itself in the cocoon of isolationism and took a rather dim view of the affairs of Europe. The events of World War I had fed into the United States' natural desire of isolationism, and this was reflected by the passage of Neutrality Acts and the general hands-off approach to the events that unfolded on the world stage. World War II presented Allied war planners with a tactical dilemma--how to make large amphibious landings of armies against defended coasts. But … It was an airstrike from the Japanese side in America’s main Navy base in the Pacific Ocean. Before America entered World War II in December 1941, individual Americans volunteered to fight against the Axis powers in other nations' armed forces. 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