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First of, World War II was the mightiest struggle humankind had ever seen. It killed more people, cost more money, damaged more property, affected more people, and caused more changes in nearly every country than any other war in history. The number of people killed, wounded, or missing between September 1939 and September 1945 can never be calculated, but it is estimated that more than 55 million people perished. You could see why the The United States hoped to stay out, drawing on its experience from World War I. Americans in general didn't want to fight a war, but were definitely not neutral in their sympathies and the actions. They lended more support to the Allies than the Axis. As You could imagine, this didnt settle well with the Axis forces.
Finally, many of the other countries that had been economically powerful were devastated by the war. This meant that the U.S. was really the only major economic power whose land and infrastructure was untouched by the war. Therefore, the U.S. had a huge advantage over the rest of the world since it did not have to rebuild after the war.The war solved some problems, but created many others. Germany had been the dominant power on the European continent, while Japan had held that role in Asia. Their defeat in World War II left open positions of leadership. The Soviet Union moved in quickly to replace Germany as the most powerful country in Europe and also aimed at taking Japan`s place as the dominant power in Asia. World War II was also the most expensive war in history. It has been estimated that the cost of the war totaled between $1 and $2 trillion, and the property damage amounted to more than $239 billion. The United States spent about 10 times as much as it had spent in all its previous wars put together. The national debt rose from $42 billion in 1940 to $269 billion in 1946.
Secondly, war officially began on September 1, 1939, when Germany attacked Poland. Germany then crushed six countries in three months. Denmark, Norway, Belgium, Luxembourg, The Netherlands, and France.Japan`s plans for expansion led it to attack Pearl Harbor on December 7, 1941, bringing the United States into the war. By early 1942, all major countries of the world were involved in the most destructive war in history. Here is Franklin Delano Roosevelt's famous "Infamy Speech" declaring war against the Japanese Empire.
As a result, World War II brought an end to the Depression everywhere. Industries had been ignited for the production of arms and resources to equip fighting forces."The man behind the man behind the gun" helped win World War II. People on the home front built weapons, produced food and supplies, and bought war bonds. The Allies not only mobilized more men and women in their armed forces, but also outproduced the Axis in weapons and machinery. Scientific inventions and discoveries also helped shorten the war. The United States organized its scientific resources in the Office of Scientific Research and Development. That government agency invented or improved things such as radar, rocket launchers, jet engines, amphibious assault boats, long-range navigational aids, devices for detecting submarines, and more. Scientists also made it possible to produce large quantities of penicillin to fight a wide range of diseases, as well as DDT to fight jungle diseases caused by insects.