What issues surrounded the entry of the U.S. Into World War 1?

The entry of the U.S. into World War I in 1917 was surrounded by several key issues, including unrestricted submarine warfare by Germany, which threatened American shipping and lives, notably in the sinking of the Lusitania. Additionally, the Zimmermann Telegram, in which Germany proposed a military alliance with Mexico against the U.S., fueled anti-German sentiment. There was also a broader ideological shift, as many Americans began to see the war as a struggle for democracy and freedom. These factors combined to shift public opinion and ultimately led to the U.S. declaring war on Germany.