Why did the House of Representitives empeach President Johnson?

The primary charge against Johnson was that he had violated the Tenure of Office Act, passed by Congress in March 1867, over his veto ... The impeachment and trial of Andrew Johnson had important political implications for the balance of federal legislative-executive power.

Answer: The primary charge against Johnson was that he had violated the Tenure of Office Act, passed by Congress in March 1867, over his veto ... The impeachment and trial of Andrew Johnson had important political implications for the balance of federal legislative-executive power.