Many exciting things in WW2 happened in December! WW2 was the largest world war of them all and had the biggest impact today! Many new technologies came out in WW2 and others, like planes and tanks from WW1 were improved upon. WW2 was a result of WW1 twenty years earlier and the Versailles treaty from WW1 helped cause it. Some well known things about WW2 are things like air-raid drills, rationing, and work done on the home-front. We entered the war in 1941 after pearl harbor.