What events brought America into the World War 1 on the side of the Allied Powers?

America entered World War I on the side of the Allied Powers primarily due to unrestricted submarine warfare by Germany, which led to the sinking of civilian ships, including the Lusitania in 1915. Additionally, the interception of the Zimmermann Telegram in 1917, in which Germany encouraged Mexico to join the war against the U.S., further galvanized public opinion. These provocations, combined with economic ties to the Allies, ultimately compelled the U.S. to declare war on Germany on April 6, 1917.