Which of the following statements regarding President Johnson's impeachment is true? Johnson was impeached but not removed from office due to insufficient support in Congress for his removal. He completed his term without being removed or resigning.

 The statement that Johnson was impeached but not removed from office due to insufficient support in Congress for his removal is true. Andrew Johnson, who became the 17th president of the United States following the assassination of Abraham Lincoln, was indeed impeached by the House of Representatives in 1868. The primary charge against him was his violation of the Tenure of Office Act by attempting to remove Edwin M. Stanton, the Secretary of War, from his cabinet. However, when the case moved to the Senate for the trial, the final vote for his conviction fell one vote short of the necessary two-thirds majority. As a result, Johnson was not removed from office and he completed his term, which ended in 1869.

Extra: Impeachment in the United States is a process by which a sitting president, vice president, or other civil officers can be charged with "Treason, Bribery, or other high Crimes and Misdemeanors," as specified by the U.S. Constitution in Article II, Section 4. The process begins in the House of Representatives, where a majority vote is required to impeach the official. Once impeached, the process moves to the Senate for a trial. In the Senate, a two-thirds majority is required to convict and remove the official from office. Andrew Johnson's impeachment was a significant event in U.S. history as it was the first time a president was impeached. It showed the tensions and political struggles during the Reconstruction Era following the Civil War, particularly between the president and the Congress, as they differed on policies regarding the reunification and rebuilding of the Southern states.