I want to talk about real life. So that's what I'm going to do.
I'd probably prevent Franz Ferdinand from being shot. If you think about it, his assassination caused the major problems of the 20th century: WWI, WWII, and the Cold War.
Bam. Just saved humanity from 70 shitty years of war.
English
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I feel like this would have been best, and if not this, insure the Triple Alliance a victory by intercepting the Zimmerman Note myself. With the coming years, I would then watch as America is not harmed by the Influenza outbreak, the empires of the alliance crumble after their victories, the Soviet Union never rising as Vladimir would be captured by the Germans and not released this time, and see the Triple Entente, excluding Russia(Double Entente), rise from the ashes. Stability would be ensured!!! Then I would eat them because I am a dinosaur.