The Japanese attack on Pearl Harborcaused about 2400 dead, almst 200 planes destroyed and 8 battleships destroyed or damaged. The long-term effect of Pearl Harbor was that it brought in the US to the war. It pushed Americans into the war that they were avoiding for so long.
Encourages dressing modestly I believe, but why is this your subject?
Woodrow Wilson confidently expected the USA to join the League of Nations. But many Americans hated the idea. Many had been against US involvement in the war, and they certainly did not want the USA to get entangled in European affairs after 1919.