the attack on pearl harbour on December 7 1941
Pearl Harbor
The Japanese attack on the US base at Pearl Harbour, Hawaii on 7 December 1941
Financial motives
unrestricted submarine warfare
Britain's involvement in the war led to the involvement of Canada, because it's a Commonwealth Nation.
No one led Russia after Lenin in World War I. Lenin ended Russia's involvement in World War I by signing the Treaty of Brest-Litovsk in 1918. World War I ended several months later in 1919. Lenin remained fully in power after the war ended.
Part of the Cold War; communist containment.
avoid mistakes that had led to American involvement in World War I
The October or Bolshevik Revolution of 1917 is the event that ultimately led to the Russian withdrawal from World War 1. The Treaty of Brest-Litovsk in 1918 was the formal end to Russia's involvement.
invasion of ethiopia, invasion of greece, incursions into north africa, declaration of war agains france
The Great Depression League of Nations formed Germany forced to pay reparations Led to WW2