Radical Republicans: A faction within the Republican Party during Reconstruction that advocated for more aggressive policies towards ensuring civil rights for freed slaves.
Reconstruction: The period following the Civil War in which efforts were made to rebuild and reintegrate Southern states back into the Union while addressing issues such as slavery, civil rights, and political power.
High Crimes and Misdemeanors: Refers to serious offenses committed by public officials that can lead to impeachment. These offenses are not limited strictly to criminal acts but encompass abuse of power or betrayal of public trust.