Several theories about slavery in the territories were solidified during the debates following the mexican war. which best describes the northern anti-slavery position?

The best theory that describes the northern anti-slavery position is the one that talks about that the congress has the roght/duty to prohibit slavery in its jurisdiction.

Hope this helps.

i really dont know the answer

answer; people where able to travel across the u.s.a faster than any other mode of transportation,travel time was about a week,from coast to coast