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What was the notion of popular sovereignty during the 19th century?

ASlavery would be decided by the Missouri Compromise.
BInhabitants of territories becoming states would decide on the issue of

slavery.

CThe practice of slavery was to be outlawed in all U.S. states.
DCongress decided whether slavery would be legal in all new states.
EThe issue of slavery would be decided through a national ballot.

Verified Answer :

Generally speaking, the notion of popular sovereignty during the 19th century was that "(B) Inhabitants of territories becoming states would decide on the issue of slavery," since this was one of the ways people thought that the slavery question would ultimately be settled. 

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