African-American heritage of presidents of the United States
Calvin Coolidge's mother Victoria Moor was claimed to be of a mixed-race family in Vermont. Vaughn noted that her surname was derived from "Moor", a European term for people of North Africa. He did not note that another meaning of her surname is the landscape feature of moor or bog. People's surnames were often based on such landscape features when surnames became generally adopted in 14th century England. Moor/Moore is a common name in England, Scotland, and Ireland.
Slavery in Spain
The Moors often served as slaves in Christian Spain. These slaves were captured from Muslim Spain and North Africa and imported into the Christian section of the Iberian peninsula. When the Moors were forcibly evicted from Spain, in 1610, Moor slaves were allowed to stay, however, they were forced to convert to Christianity. Spain's Moorish slave population was eventually freed in the early 18th century.