What led to the US into World War 1?

Answer 1

The United States entered World War I primarily due to unrestricted submarine warfare by Germany, which threatened American shipping and lives, exemplified by the sinking of the Lusitania in 1915. Additionally, the interception of the Zimmermann Telegram, in which Germany proposed a military alliance with Mexico against the U.S., heightened tensions. Economic interests also played a role, as American banks and businesses had substantial investments in the Allies. Together, these factors ultimately pushed the U.S. to declare war on Germany in April 1917.