Plessy v. Ferguson (1896) was a decision that stated that the laws of racial segregation don't violate the Constitution.
Your information is incomplete. Therefore, an overview will be given. The Immigration Act of 1924 was an act that was used in limiting the number of immigrants that were allowed to enter the United States.
The Immigration Act of 1965 was also used in limiting the number of people that entered into the country.
Korematsu v. United States (1944) was a case where the court upheld a restriction on civil liberties.
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