Which were results of the construction of the transcontinental railroad? choose all answers that are correct.
a. the railroad cut travel time between the east and west coasts of the united states by many weeks.
b. the railroad allowed the great plains to become the most densely populated region of the country.
c. the railroad made the plains indians wealthy because they owned the land it crossed.
d. the railroad led to the creation of uniform time zones in order to make scheduling trains easier.

it the big letter b heart my answer

abraham lincoln, according to anyone who was connected with agriculture, represented the worst of northern politicians. shortly after lincoln was elected, south carolina seceded from the union. they along with other southern states, retained their anger. in a way, it was their own fault: the democrats were split in the south. some wanted slavery to be extended in other states that were about to join the union and some didn't want it badly enough. lincoln had a solid backing from his party: the republicans were united in not wanting slavery to be expanded.