Which of the following was a reason for the growth of cities in the late 1800s? a. the federal government passed the urban act of 1870, which required people to move to cities. b. too many people were already living in rural or country areas. c. the cities offered much more space for people. d. factory jobs were plentiful and available in the cities.

 B is the answer. Factory jobs were plentiful and available in the cities.
People start moving in from the countryside because of industrialization expansion. This Industrial Revolution started in the mid to late of the 18th century, therefore by 1800's population flocked to the opportunities to earn money.

Because broadest terms allows the law flexibility depending on changing society and circumstances.

The transcontinental railroad provided a means of fast transportation. it cut a 6 month trip into 6 days, created jobs for many people and encouraged immigration. the homestead act played a huge role in western expansion; it allowed settlers to begin a fresh start, and gave them land in exchange for their residence for up to five years and a small fee.