Who was the president after the Civil War and was acquitted in 1868?

Andrew Johnson was the president after the Civil War who was acquitted in 1868. He assumed the presidency following Abraham Lincoln's assassination in April 1865. Johnson, a Southern Democrat who had been a staunch Unionist during the Civil War, faced significant opposition during his presidency, particularly from the Radical Republicans who sought to impose strict terms on the Southern states after the war.

In 1868, Johnson became the first American president to be impeached, primarily due to his violation of the Tenure of Office Act, which was designed to restrict the president's power to remove certain officeholders without the Senate's approval. His impeachment trial was a highly publicized event that resulted in his acquittal by just one vote in the Senate, allowing him to complete his term in office. This significant moment in U.S. history illustrates the intense political struggles during the Reconstruction era and the complexities of Johnson's presidency.

The other individuals listed did not serve as president immediately after the Civil War or were not involved in impeachment proceedings during that time. Abraham Lincoln was assassinated prior to the Civil War's conclusion, James Buchanan was president before the war, and Ulysses S. Grant took office after Johnson's presidency.