Question

what happend in world war 2?

Answer 1

British and American forces had defeated the Italians and Germans by 1943.

Answer 2

thx for the medal

Answer 3

A lot

Answer 4

Many notable events occurred during World War 2. In addition to those already mentioned, consider investigating the Holocaust, the bombing of Pearl Harbor, and the use of nuclear weapons in Nagasaki and Hiroshima.
As other users have mentioned, many important events occurred during World War 2, so it is difficult to form an exhaustive list. I hope that this will be enough to get you started in your investigation, although it is by no means a definitive and comprehensive summary of events.