WWII had little to do with America? Go look up lend/lease and then remember we were bombed by Japan. The US was intrinsically linked to WWII from the beginning, just not with troops on the ground.
Yes, it was. America was setting up the scene for the pacific war by raising customs and tariffs on Japanese imports with the Smoot-Hawley Tariff Act (1930). The Japanese were just democratizing when the US decided to kill their economy. Thus, the Japanese had one of two choices - take needed resources they purchased before by force, or accept a massive decline in standard of living. They decided to take the first route. Attacked the Chinese, and when the US started sanctioning it, eventually they bombed Pearl Harbour.
And don't forget how the Nazis were basically funded out of American pockets.
Just because the first shot was not fired by an American does not mean they were not the cause.
WWII had very little to do with America in the sense that the American involvement was only a reaction to others messing things up.
While the other two are purely American.