1. Chinese Exclusion Act of 1882 banned Chinese immigration for ten years under penalty of imprisonment or deportation . This act was extended in 1888, 1892, 1894, 1902, and 1904. In response the Chinese resisted through labor strikes, lawsuits, and in print journalism. The formation of designated Chinatown's was a response to their marginalization from mainstream American society. As a result of this law there are 7 Chinatown's in the United States today.
2. The National Origins Act of 1924 established a quota system determining how many immigrants could enter the United States. While the quota was heavily modified in 1965, the Act established a system of consular based immigration, which required immigrants to have a visa issued to them by an American consular officer prior to immigrating to the United States. This practice is still in use today. This act marked the beginning of the term "illegal immigrants."
3. After the Reconstruction in 1877, "Pig Laws" were established which unfairly penalized poor African Americans for crimes such as stealing a farm animal, hence the name. Many misdemeanors or trivial offenses as felonies. Once they were in the system as a criminal, they lost the right to vote, had a very hard time finding jobs, and were restricted in movement across the country and outside of the country. These laws stayed on the books for decades and expanded further in the Jim Crow era. Due to these policies, the majority of African Americans still live in the southern states today.
Second Question: The strategies of activism and social movement contributed to social change in the U.S. include lawsuits like Brown v. Topeka Board of Education, nonviolent civil disobedience in refusing to obey discriminatory laws, and boycotts such as the Montgomery Bus Boycott.