So one of the reasons history classes tend to be really into wars is that they're easy to put on tests. They start on one day and they end on another day, and they're caused by social, political, and economic conditions that can be examined in a multiple-choice kind of manner. Except, not really. Like, when did World War II start? In September 1939, when the Nazis invaded Poland? I'd say no, it actually started when Japan invaded Manchuria in 1931, or at the very latest when the Japanese invaded China in 1937, because they didn't stop fighting until 1945. Then again, you could also argue 1933, when Hitler took power, or 1941, when America started fighting.