Which were results of the construction of the transcontinental railroad? choose all answers that are correct.
a. the railroad opened up the great plains and the west coast to waves of new immigrants from europe.
b. when the line was completed, americans were so that they reelected president lincoln for a second term.
c. the rail line crossed long-established native american trails and disturbed buffalo-hunting grounds.
d. railroad owners leland stanford and thomas durant were convicted of bribery and sent to prison.