A major reason the United state’s entered world war 1 was to

- Unrestricted submarine warfare

- Zimmerman Telegram

Explanation:

The United States entered World War I due to two major reasons: Germany's unrestricted submarine warfare and the Zimmerman Telegram.

Germany sank many American merchant ships around the British Isles in addition to the Lusitania, a British passenger ship. The sinking of the Lusitania resulted in a great loss of life.

The Zimmerman Telegram was a telegram from the German Foreign Office that proposed a military alliance between Germany and Mexico. In this telegram, Germany promised Mexico significant financial aid if they agreed to join the war as a German ally.

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