Why Did War Break Out in 1939?

Why Did War Break Out In 1939?
Introduction
There wasn't just one main cause or reason for the outbreak of war in 1939. In fact, it was the build up of many different factors that led to the Second World War. The following are the factors that led to war:
The rearmament of Germany
German rearmament began after Hitler left the 1932-34 Geneva Disarmament Conference. He stated that as the victors of WWI would not disarm to his level, he would rearm Germany to their level. By 1935 rearmament was well underway. This involved conscription and munitions factories.
Rearmament alarmed the French…