Please fill in the blank. Part of the Compromise of 1850 was the _____, which required northerners to more actively participate in the capture of escaped slaves. In this case, the so-called states’ rights position between the North and South was reversed because it was the South that insisted on the strict enforcement of this federal law, while some northern states passed _____ that prohibited state officials and institutions from capturing escaped slaves to block enforcement of this federal law.

Please fill in the blank. Part of the Compromise of 1850 was the _, which required northerners to more actively participate in the capture of escaped slaves. In this case, the so-called states’ rights position between the North and South was reversed because it was the South that insisted on the strict enforcement of this federal law, while some northern states passed _ that prohibited state officials and institutions from capturing escaped slaves to block enforcement of this federal law.