Final answer:
Richard Nixon resigned from the presidency in the 1970s before facing impeachment, making him the first and only U.S. president to do so.
Explanation:
Richard Nixon resigned as the President of the United States in the 1970s, specifically in July 1974. He stepped down before the House could vote on impeachment, becoming the first and only American president to resign from office. His resignation was a result of the Watergate scandal and his refusal to produce White House tapes.
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