Wilson's presidency was marked by several significant events, including:

1. The sinking of the Lusitania: In 1915, the German U-boat U-20 sank the British passenger ship Lusitania, killing over 1,000 people, including many Americans.
2. The Zimmermann Telegram: In 1917, Germany sent a coded message to Mexico, urging it to declare war on the United States. The message was intercepted and decoded by British intelligence, leading to a significant increase in anti-German sentiment in the United States.
3. The Russian Revolution: In 1917, the Russian Revolution led to the overthrow of the Russian monarchy and the establishment of the world's first socialist state.