7. As the United States expanded westward, the issue of slavery became more of a concern for the North during Congressional debates. This was because -

A-Slave uprisings occurred throughout the south and in western territories

B-Western territories did not want slavery

C-Many were afraid that slavery would expand across the west

D-Western territories were in favor of slavery

The westward expansion carried slavery down into the Southwest, into Mississippi, Alabama, crossing the Mississippi River into Louisiana. Finally, by the 1840's, it was pouring into Texas. ... So that it was slavery itself which made the progress of civilization possible.

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