Why did the United States enter wwl?

The United States entered World War I in April 1917 primarily due to unrestricted submarine warfare by Germany, which threatened American commercial shipping and lives. The sinking of ships like the Lusitania, along with the interception of the Zimmermann Telegram—where Germany proposed a military alliance with Mexico—fueled public support for joining the conflict. Additionally, the U.S. aimed to protect its economic interests and promote a vision of a world safe for democracy.