The policy that allowed settlers in new territories to decide whether to allow slavery was called popular sovereignty. Option A is correct.
Sovereignty is a political notion that implies to supreme authority or dominant control.
The “sovereign,” or king, holds supreme power in a monarchy.
Sovereign power in liberal nations lies with the people, who exert something through representative bodies like Congress or Legislature.
Popular sovereignty was a policy that permitted colonists in new regions to choose whether to permit slavery.
Therefore, option A correct.
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