There were a few different events that lead to WWI, but one major one was the Zimmerman Telegram. It was a telegram from Germany to Mexico. It proposed that Mexico join the war on their side, and in return, Germany would help Mexico win back it's territory from the US, such as Texas, Arizona, and New Mexico.
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The Bolshevik Revolution was the event that led to Russia's early exit from World War 1. It was a costly war for Russia.
The assassination of Archduke Ferdinand was a major event that led to WW1
the invention of the machine gun.
Gen. Pershing
True