How did the nation get pulled apart when the fugitive slave act pass?

The Fugitive Slave Law was laws passed by the United States Congress in 1793 and 1850 to provide for the return of slaves who escaped from one state into another state or territory.

This act pulled America apart because at the time the North or Confederate States, did not allow slavery. since this one against their laws of having slaves in the North it brought the battle or more clearly the Civil War