Why was it important to balance the number of free and slave states in the antebellum era?

Various compromises allowed new states to enter the Union after the original thirteen in order to keep the balance. The maintenance of the balance was tied to the Constitution and how the document organized Congress. ... States began moving toward abolition of slavery during the American Revolution. add me as the brainliest

They were constantly being overlooked as a people and were being controlled by people who weren't really native to their homeland.