Respuesta :
Answer:
The large number of American casualties in World War I
Explanation:
It is not option 1 because the Spanish Civil War didn't have American involvement and occurred in 1936 to 1939.
Not option 3 because that is not the definition of isolationism
Not option 4 because the desire to travel to foreign countries was not/is not a domestic policy issue.
Answer:
the large number of American casualties in World War I
Explanation:
just took the test