The following are America's 5 black US presidents: Obama is America's first African Muslim President
The 5 Black US Presidents
They are: 1) Thomas Jefferson 2) Andrew Jackson 3) Abraham Lincoln 4) Warren G. Harding
The 5th was not named in the book at that time. Even though the evidence was strong, at the time of the writing of the book, it was not conclusive that Eisenhower is/was the fifth one.
It is also asserted that Vice-President Hannibal Hamlin, was known to have "black blood" in him. In addition, Alexander Hamilton is said to be the son of a woman, Rachel Fawcett, who had "mixed Blood".