One impact of the transcontinental railroads reaching Washington was:
OA. the population grew from about 10,000 to 25,000 in 20 years.
B. the population grew from about 75,000 to over half a million in 20
years.
C. the population shrank because people could use the railroad to
migrate east.
OD. the population grew from half a million to over a million in 20
years.