How did the United States contribute to the outbreak of World War Two?
The original answer here was not mine. I have no idea how it said it was. My answer is stated above.
To place any blame on the outbreak of World War Two on the United States is placing blame on the wrong nation. If Great Britain and France knew their policies of appeasement would fail to satisfy Nazi Germany, then they would have taken advantage of German military strength long before it became a vital threat. The Treaty of Versailles was a bad treaty, it added later on to German nationalism and eventually to Nazi fascism.Imperial Japan, whose emperor was treated as a god, already had problems just by it's own making. The emperor and his military dictators could have prospered as it does today, by using their skills at making war, to skills for building consumer products to compete in the world.
Stalin, dictator number 2 in cruelty, chose to make a treaty with Hitler, dictator number 1. We can charge off Mussolini, he gained by his alliance with Hitler, and when it came to war, Italy did little to threaten any nation, except for poor underdeveloped ones.