Which of the following was a reason for the growth of cities in the late 1800s?

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

Two gymnastics teams are intense rivals. the first team has started recruiting new gymnasts from different cities and even foreign countires in an effort to build a stronger team. after learning this, the secondteam begins its own recruitment campaign to find better gymnasts. over a period of months, each team recruits dozens of players, each time trying to find a better recruit than its rivals most recent addition. which idea from the cold war is most similar to this scenario