The document discusses key events and people during the Reconstruction era after the American Civil War. It describes how President Andrew Johnson responded to and vetoed the First Reconstruction Act which placed the former Confederate states under military control and required new state constitutions extending suffrage to all men. Congress overrode Johnson's veto. It then discusses how the House investigated and impeached Johnson, bringing charges against him in a Senate trial for violating the Tenure of Office Act, though he was ultimately acquitted. The 14th and 15th Amendments granting rights to freed slaves are also mentioned.