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Who is the youngest person to become president of the United States, and how did he get into office?
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The youngest person to become President of the United States was Theodore Roosevelt. He assumed office at the age of 42, following the assassination of President William McKinley in 1901. Roosevelt was serving as Vice President at the time, and according to the U.S. Constitution, the Vice President is the first in line of succession to the presidency in the event of the president's death, resignation, or removal from office. This is how Roosevelt became President, making him the youngest person to hold the office in American history.