Which 19th century war demonstrated that the united states was a world power? a) world war i b) world war ii c) the civil war d) the spanish-american war eliminate

C. Civil War because world war 1 & 2 were in the 20th century

For a start, WW1 and WW2 happened in the 20th century.
Fighting amongst themselves doesnt' make them a world power, so It can't be that one.
The obvious answer is the Spanish-American war.

The answer b is correct this all occurred during the red scare