Answer:
a. the court found him guilty of violating the tenure of office act.
Step-by-step explanation:
The impeachment of former President Andrew Johnson is considered to be a result of the political and ideological conflicts that came to exist during and after the American Civil War.
The one thing that made the politics to start the impeachment proceedings against the Johnson happened when he removed Edwin Stanton from the government. Edwin was the Secretary of War whom had been a problem to both Johnson and Lincoln.