Who served as vice president and became president following Harrison's death?

The correct answer is John Tyler, who served as vice president under President William Henry Harrison. After Harrison's death in April 1841, Tyler ascended to the presidency, becoming the first vice president to do so due to the president's death. This event set an important precedent for the continuity of government and clarified the line of succession, which had not been formally established prior to Tyler's presidency.

Tyler's presidency was notable for his assertiveness in asserting his authority as president despite the political challenges he faced, especially from Whigs who had initially supported him as a vice president but grew disillusioned with his policies. His ascension marked a significant moment in U.S. history, as he faced the difficult task of filling the leadership vacuum created by Harrison's untimely death. Tyler's presidency ultimately paved the way for future discussions around presidential succession, which would later be codified in the 25th Amendment to the Constitution.