How did territorial expansion lead to World War 2?

In the decade prior to WWII Japan, Italy and Germany were looking to expand. Japan invaded Manchuria in 1931. Italy invaded and attempted to colonize Ethiopia in 1936, and soon after invaded Albania. Under the leadership of the Nazi regime, Germany expanded by uniting with Austria, invading Rhineland, and demanding that Czechoslovakia give Sudetenland back. This type of expansion angered the League of Nations and broke the Treaty of Versailles, which ultimately led to WWII.