1 Sep 1939—2 Sep 1945: World War Two war fought on a global scale between the Axis Powers (Germany, Italy, Japan) and the Allied nations (U.S., France, Great Britain)
2
1941
7 Dec 1941: Attack on Pearl Harbor Japan attacks U.S. Pacific Fleet at Pearl Harbor Hawaii. United States declares war on Japan and Germany.
Bef 1920 - Yes, date unknown