In the 1860's, a railroad was built connecting the East Coast of the United States with the West Coast. What was one important effect of this? (SSUSH12a)
O
A
People did not use any other form of transportation
It took longer to travel from San Francisco to New York.
ООО
C
People could now fly by airplane to get to places more quickly
D
it became quicker to travel from San Francisco to New York