Andrew Johnson served as the 17th president of United States from 1865-1869. He assumed presidency after Lincoln's assassination and his term was marked by opposition towards Radical Republicans' policies on reconstruction.
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Impeachment of Andrew Johnson: This refers to when President Johnson was impeached by House Representatives due to violation of Tenure Office Act but he narrowly escaped removal from office by Senate.
Tenure of Office Act: This was a federal law intended to restrict the power of President to remove certain office-holders without Senate's approval. Johnson's violation of this act led to his impeachment.
Black Codes: These were laws passed by Southern states during Johnson's presidency with aim to restrict African Americans' freedom and compel them to work in labor economy based on low wages or debt.