The two correct answers that were causes of Andrew Johnson's impeachment are:
- Johnson broke the law when he fired Secretary of War Edwin Stanton without Congressional approval.
- Johnson vetoed the Civil Rights Act and refused to support other reform legislation that granted African Americans more rights.
These actions were central to the impeachment proceedings against him, as they were viewed as violations of the Tenure of Office Act and as undermining the efforts of Congress to protect the rights of African Americans during the Reconstruction era.