Why was compromise no longer possible between the north and the south in the united states by 1860?

As the result of a conflict between british troops and a colonial militia in massachusetts

All of the following were weaknesses of the articles of confederation, except: a) the central government was not permitted to regulate state, interstate, or foreign trade. b) the central government was not permitted to borrow money. c) the central government had little ability to regulate money. d) the central government had no ability to tax.

Which type of constitutional power allows congress to regulate immigration and naturalization?