WWI, WWII, Vietnam war, collapse of the soviet union, I could go on and on.
The Crusades happened almost a thousand years ago-why do they still provoke an argument? Osama bin Laden has used them to attempt to rally the Islamic world to his cause; President Bush has called...
The Vietnam war was going on...
They participated in the War of 1812 fighting with the British and against the Americans.
Many things happened worldwide. The question is too broad