Nine.
Five of them were not elected to a term in their own right - Tyler, Fillmore, Andrew Johnson, and Ford.
the other four were elected to their own term after finishing the term of their deceased predecessors - Theodore Roosevelt, Coolidge, Truman, and Lyndon Johnson.
Harry Truman, Andrew Johnson, John Tyler, lyndon B Johnson, Chester A Arthur, Theodore Roosevelt, Calvin Coolidge, Millard Fillmore.
John Tyler. He was elected Vice-President under William Henry Harrison. When Harrison died after only one month in office, VP Tyler became President.
he was not elected
"Accidental President" or "His Accidency
He was elected as the vice-president and became the president because the President took sick and died. He was the first president to take office without being elected to the position, and the press of the day called him "His Accidency" throughout his term of office.
accidental president
The Accidental President - 2014 TV was released on: USA: 1 January 2014
The first accidental president was John Tyler. He assumed the presidency in 1841 after the death of President William Henry Harrison. Tyler, who was the vice president at the time, became president due to the unexpected death of Harrison and the unclear succession process outlined in the Constitution.
John Tyler who was the vice president. After Harrison died, Tyler became the "accidental president".
Once McKinley was assassinated, Teddy Roosevelt became President.
Virginia was the home state of John Tyler, who was the first vice-president to assume the office of President due to the death of the elected president.
oil spill
Every life form is probably the product of accidental mutations! Nowadays mutations are not necessarily accidental--they are called genetically modified organisms (GMOs).
oil spill