A big problem for the Northern states after the Compromise of 1850, was the , which forced them to send escaped slaves back to the South.

Fugitive Slave Act.

Explanation: Though the north was mostly abolitionist, the passing of this made it illegal for northerners to help out slaves escaping to the north. It also allowed southern slave hunters to enter the north in order to capture said escaped slaves.

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You don’t have to names or other options up here so idk dude