Abraham Lincoln was the first mixed race president. His mother descended from an Ethiopian tribe. 
Author Dr. Leroy Vaughn in his book "Black People and Their Place in History" writes, "Lincoln had very dark skin and coarse hair and his mother allegedly came from an Ethiopian tribe. His heritage fueled so much controversy that Lincoln was nicknamed "Abraham Africanus the First" by his presidential opponents and cartoons were drawn depicting him as a Negro."
In a book entitled "The Hidden Lincoln" written by William Herndon, Lincoln's law office partner said that Lincoln's father of record, Thomas Lincoln, could not have been Lincoln's father because he was sterile from childhood mumps and later castrated.
In a book entitled "The Hidden Lincoln" written by William Herndon, Lincoln's law office partner said that Lincoln's father of record, Thomas Lincoln, could not have been Lincoln's father because he was sterile from childhood mumps and later castrated.