"The race of Sally Hemings's and Thomas Jefferson's son, Eston Hemings, was indisputably "black" while he was a slave at Monticello. Years later, living in Ohio in 1850 as a free man, Eston was described by a census taker as "mulatto." A decade later, Eston and his wife had moved to Wisconsin where a census taker listed them as "white." What was the "truth" of Eston Hemings's race? To answer the question is to take a journey through America's mixed-race past."