What was the "final straw” that made President Wilson ask Congress to declare war?

Question

the Zimmermann Telegram
Germany’s progress on the eastern front
Germany's declaration of war on France
the sinking of the Lusitania

Answer 1

The "final straw" that made President Wilson ask Congress to declare war was the Zimmermann Telegram. This secret communication from Germany to Mexico proposed a military alliance against the United States, which, along with Germany's unrestricted submarine warfare that led to the sinking of American ships, pushed the U.S. closer to entering World War I.