How did slavery cause sectionalism in the antebellum era? Southern politicians supported the expansion of slavery into new states.
Northern politicians backed the spreading of slavery only into far western territories.
The South wanted slavery to continue in existing states but not in new states.
The North wanted slavery to expand slavery into only a few Northern states.

Southern politicians supported the expansion of slavery into new states

Explanation:

The South tried their hardest to get slavery in the new territories, with Texas and Missouri both being notable examples. The north did not want the South to make slavery constitutional, and they did not support the expansion of slavery whatsoever.

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