sentences:  At the time, prior to the Great Migration, African Americans made up the majority of population in numerous counties, and he advocated a practice of racial eugenics.In this period, southern states were passing laws to disenfranchise African Americans and exclude them from the political system, while passing Jim Crow laws and the one drop rule, which penalized persons of any known African ancestry.During Barringer's tenure as chairman of the faculty, U.Va., perceived by many Southerners as the region's flagship university, became a hotbed of eugenics teaching that continued under its first president Edwin Alderman who took over when the Jeffersonian system of faculty rule ended in 1904.