Assignment task: The "Century of Immigration" (1820-1920) when mass immigration was basically almost unlimited, ended with a period when mass immigration was about to be severely shut down. What are some of the things that happened during this period to bring about this occurrence? What role did nativism and nativist thinking play? Historical events and national developments? A change in the nature of immigration? Trace steps in the gradual closing of the gates and increasing restrictionism during this period, giving some highlights as examples. (ANSWER IN DETAIL AT LEAST FIVE HUNDRED WORRD COUNT)