American immigration policies from the 20th century

. Few important American immigration policies from the 20th century
·         Give a brief narrative regarding a few important American immigration policies from the 20th century.
·         Who were the "new immigrants" in the early 1900s?
·         What challenges did they face?
·         What is the significance of Ellis Island?
·         What did the Immigration Act of 1924 do, and how did that differ from the Immigration Act of 1965?
·         What are your opinions regarding the present debate surrounding undocumented workers and illegal aliens?
·         Should there be, as the current phrasing is discussed, a "pathway to citizenship"?