Respuesta :
Answer:
The United States later declared war on German ally Austria-Hungary on December 7, 1917. Germany's resumption of submarine attacks on passenger and merchant ships in 1917 became the primary motivation behind Wilson's decision to lead the United States into World War I.
Explanation:
Hope this helps you have a blessed day :)
why America joined WW1 is when the war began with nazis Germany attack on Poland in September 1939, the United States did not enter the war until after the Japanese bombed the American fleet in Pearl Harbor Hawaii in December 7, 1941. Hope this helps , brainliest would be appreciated !
