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Answer:
war that changed all aspects of life—from economics, to justice, to the nature of warfare itself—the scientific and technological legacies of World War II had a profound and permanent effect on life after 1945. Technologies developed during World War II for the purpose of winning the war found new uses as commercial products became mainstays of the American home in the decades that followed the war’s end. Wartime medical advances also became available to the civilian population, leading to a healthier and longer-lived society. Added to this, advances in the technology of warfare fed into the development of increasingly powerful weapons that perpetuated tensions between global powers, changing the way people lived in fundamental ways. The scientific and technological legacies of World War II became a double-edged sword that helped usher in a modern way of living for postwar Americans, while also launching the conflicts of the Cold War
At a slow and deliberate pace, the United States was rearming at the time of Pearl Harbor. The divide was also severe. The population had sympathy for Britain and was eager to help both it and the Soviet Union. Even while most Americans didn't like Hitler, they were still against starting the war.
This is the significance of America entering the war:
- United Nation: Instantly after Pearl Harbor, the influential isolationist movement was eliminated. As a result, America waged war as a resolute, united nation with almost no anti-war movement.
- Arsenal of Democracy: All financial restraints and limits were abolished after Pearl Harbor. The President virtually had a blank check from Congress to wage the War. Only one Congressman (Senator Truman) ever discovered the enormous concealed funding for the atomic bomb since it was so extensive. Even America's allies and the Axis were stunned by the overall production.
- Massive Spending: The Germans' extensive rearmament effort had a significant role in their victories at the start of World War II. The United States spent more money than any other nation had ever spent on a war to support both its soldiers and its allies during World War II. In the process, it accumulated the largest national debt of any nation in history, not just in American history.
- Balance of power: Because of the enormous magnitude of the American industry—which was considerably greater than Germany and, for that matter, the entire Axis—American participation altered the balance of military production. Simply put, the only nation competent to conduct global warfare was America.
- Lend Lease: The American military would be equipped much more quickly because to mobilization, and our Allies would likewise receive more weapons and supplies much more quickly.
- Nuclear weapons: The US developed nuclear weapons in addition to producing vast quantities of conventional weaponry. By joining the conflict, the plan to develop an atomic weapon was approved.
- Strategic Bombing Campaign: The U.S. Army Air Corps started the preparations in Britain for the strategic bombing campaign against Germany as soon as it entered the conflict.
- Anglo-American Alliance: When the United States and Britain joined the conflict, unified military preparation was put into motion. Operation Torch was the first outcome.
- D-Day: The Western Allies now possessed the military capability to reenter the Continent as the War progressed. Britain was unable to accomplish this on its own. Germany had to devote resources toward erecting the Atlantic Wall in 1942, and by 1943, it had started moving significant forces from the Eastern Front to the Western Front. D-Day, however, did not take place until 1944.
- The Democracies: The authoritarian Soviet Union was the main force against Germany before America entered the War. The Atlantic Charter's tenets gained actual weight when America joined the conflict, making the democracies (Britain, America, the Dominions, and the Free French) an equal combatant. This was crucial for the period following the War as much as during it.
- Western Contribution: The Soviet Red Army defeated the German Army in the East. Additionally crucial and in a big way contributing to Soviet triumph on the Eastern Front was the Western participation.
- Saving the West: Not just the NAZIs started the Second World War in Europe. With the Nazis, the Soviet Union formed an alliance. Both nations entered Poland (September 1939). Additionally, the Soviets attacked nearby nations. The Soviet Union was able to avoid doing in the West what they accomplished in the East thanks to America. In Western Europe, there wouldn't be any communist NKVD police states.
Thank you,
Eddie
