Answer:
14 vice presidents
Step-by-step explanation:
Of the 14 vice presidents who fulfilled their ambition by achieving the presidency, eight succeeded to the office on the death of a president, and four of these were later elected president. Nine vice presidents have ascended to the presidency in this way – eight (John Tyler, Millard Fillmore, Andrew Johnson, Chester A. Arthur, Theodore Roosevelt, Calvin Coolidge, Harry S. Truman, and Lyndon B. Johnson) through the president's death and one (Gerald Ford) through the president's resignation.