Our first president to be impeached was Andrew Johnson in 1868. 11 articles of impeachment were brought against Johnson, mainly for violating the Tenure of Office Act by removing the Secretary of War without congressional approval.
Thomas Nast drew the following cartoon, published in Harper’s Weekly on March 21, 1868, showing a little Andrew Johnson crushed by a large copy of the U.S. Constitution. (The Senate failed to convict Johnson and he remained in office.)
Image credit: The Library of Congress.