Why did the united states get pulled into ww1

The United States got pulled into World War I for multiple reasons. One of the reasons was because Germany sunk the British passenger ship, the Lusitania. he ship was carrying many americans. The other main reason, and tipping point, was the interception of the Zimmerman telegraph. The telegraph said that if Mexico helped Germany defeat the Allies, then once Germany won, Mexico would get back the land the states won from them, including texas and California.