What factors led to the US involvement in World War I?

Reasons the United States Entered the First World War

Explanation:

1.The Lusitania . In early 1915, Germany introduced a policy of unrestricted submarine warfare in the Atlantic. This meant U-Boats were hunting and sinking merchant shipping without warning.

2.American loans. The US had a vested financial interest in the outcome of the war in Europe. American businesses and banks made huge loans to the Allies. If they didn’t win then they were unlikely to get their money back.

3.The Zimmerman Telegram. In January 1917, the German diplomatic representative in Mexico received a secret telegram penned by German Foreign Secretary Arthur Zimmermann. It proposed a secret alliance between Germany and Mexico, should the United States enter the war. If the Central Powers were to win, Mexico would be free to annex territory in New Mexico, Texas and Arizona.

the answer to number 5 is fort sumter