What was the immediate cause of the US entering ww1?

The immediate cause of the United States entering World War I was the interception of the Zimmermann Telegram in January 1917, in which Germany proposed a military alliance with Mexico against the U.S. Additionally, Germany's unrestricted submarine warfare, which led to the sinking of ships like the Lusitania and the loss of American lives, heightened tensions. These provocations ultimately pushed the U.S. to declare war on Germany on April 6, 1917.