Answer:
Civil Rights Act of 1866
First United States federal law to define citizenship and affirm that all citizens are equally protected by the law (especially African-Americans)
The Civil Rights Act of 1866 (14 Stat. 27–30, enacted April 9, 1866, but not ratified until 1870) was the first United States federal law to define citizenship and affirm that all citizens are equally protected by the law. It was mainly intended, in the wake of the American Civil War, to protect the civil rights of persons of African descent born in or brought to the United States.
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