How did the mexican american war ignite a conflict over slavery between the north and the south?

becasue in the south they disallowed slavery but in the north slavery was illegial this boilled into because mexico wanted slavery

becasue in the south they disallowed slavery but in the north slavery was illegial this boilled into because mexico wanted slavery

hope this

the qing dynasty placed strict limits on foreign merchants' ability to trade in china.

b: the establishment clause  

b: socialism