How did the fugitive slave act contribute to sectional tensions over the issue of slavery? a. many northern factory owners supported the law because it kept the costs of labor low. b. many southerners filed lawsuits in state courts in order to block the enforcement of the law. c. many southern citizens resented the intent of the law, and the movement for succession gained support. d. many northerners refused to cooperate with the enforcement of the law, and the abolition movement grew stronger.