Many of the people who have come to Mexico City have ended up living in "surrounding" areas, since life in the city itself is very fast paced and dense, meaning that many people wish to enjoy the benefits of the city without being there directly.
Answer:
The protesting in various cities in the south as well as boycotts like the Montgomery bus boycott helped African Americans seek a better life. They wanted the right to vote as well as to desegregate the south because it was inherently racist and unethical