Historically, the most significant geographic obstacle to the western migration of people from the east coast of the united states during the 19th century was a) the great plains. b) the rocky mountains. c) the mississippi river. d) the appalachian mountains.

What did the u.s. want to build on the land acquired through the gadsden purchase?

Which of the following world and national events led to a new view of people with disabilities in the us:     a.  world war i and ii veterans with disabilities returned home after the wars.b.  john f. kennedy was elected president and had a sister with a disability.c.  the civil rights and feminist movements.d.  all of the above.

Which describes a significant different between the north and the south in the year leading up to the civil war