There were 16 free states
Dred Scott based his claim for freedom on the fact that his master had taken him to free states and territories.
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Dred Scott sued for his freedom because he had lived in states and territories where slavery was prohibited, and he believed that this should have made him a free man. He argued that his time in free territories had legally made him a free person.
to prevent the spread of slavery westward as new territories became states.
To end an argument about slavery in the territories (apex)
It drew a line through western territories to determine future free and slave states
18 states were free states, 15 states were slave states 33 states overall
They opposed the extension of slavery into the western territories.Below is a link with more info.united-states-free-soil-party
Dred Scott based his claim for freedom on the fact that his master had taken him to free states and territories.
The national government wasn't sure whether to make the new territories "slavery-free" states or slave states.
The issues of whether the new territories should be free or slave states were a big problem. The balance between free and slave states needed to be kept in check, which was hard to do when new states were annexed. This issue led to the Civil War.