Which Vice President became president after Zachary Taylor died in 1850?

Which Vice President became president after William McKinley was assassinated? Which Vice President became president after Franklin D. Roosevelt died in 1945? Which Vice President became president after Warren G. Harding died in 1923? Which Vice President became the first to succeed a president who died in office, in 1841? Which Vice President became president after James Garfield was assassinated? Which president wrote the Declaration of Independence? Which president is known as the "Father of the Constitution"? Which president made the Louisiana Purchase in 1803?