Who was the first and the only US president, forced to resign from his post?

Question

Who was the first US president to succeed to the Presidency upon the assassination of his predecessor and the first US President to be impeached?

Answer 1

Richard Nixon was the first and the only US president, forced to resign from his post. He was the 37th President of the United States from 1969 until 1974, when he resigned from office, the only U.S. president to do so. He had previously served as the 36th Vice President of the United States from 1953 to 1961 under the presidency of Dwight D. Eisenhower, and prior to that as a U.S. Representative and also Senator from California.