What was the main reason for sectional differences that existed in the United States in the early 1800s?

What were three advantages the north had in the civil war? it was fighting most battles on home ground. it had a greater number of soldiers. it had more highly skilled military leaders. it had a stronger navy. it had a better network of railroads. pick three .

The permo-triassic extinction event had a greater impact on the number of earth's species than did the extinction event at the end of the cretaceous true false

During the 1920’s why did the us policy change