Problem What role did slavery play in adding new territories and states west of the Mississippi River?
Adding western states as free or slave states helped to maintain the balance of power in the
AO
U. S. Senate.
B
Slavery was not legal west of the Mississippi River.
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Most of the abolitionist movements of the 1800s began in western territories and states.
Because the western territories relied on a plantation economy, slavery was legal in all new
D
territories and states.