Question: When did the united states get involved in ww1?
Disambiguated questions and answers: question: On what date did the US formally get involved in WWI?
What event prompted the US to get formally involved in WWI?
answer: April 6, 1917
Sinking of American merchant ships
sinking American merchant ships
Natural Questions answer: April 6 , 1917 (from the Wikipedia article "United States in World War I")