Question

which of the following was a reason the us adopted a policy of isolationism before world war ii?
the large number of american casualties in the spanish civil war
the large number of american casualties in world war i
the desire to get americans involved in world conflicts
the desire to help americans travel to foreign countries

Explanation:

Isolationism pre-WWII in the US stemmed from widespread public opposition to foreign conflicts, driven by the heavy losses (casualties) the country suffered in World War I. The other options are incorrect: Americans had minimal casualties in the Spanish Civil War, isolationism avoided foreign conflict involvement, and it did not relate to facilitating foreign travel.

Answer:

the large number of American casualties in World War I