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Page 62 of Falls Church: A Virginia Village Revisited https://www.amazon.com/dp/157864111X/ref=cm_sw_r_cp_apa_i_HTaPCbK8G95XW
"A section of the town south of the thoroughfare then known as the Falls Church and Fairfax Courthouse Road was by a Virginia Act of Assembly returned to the jurisdiction of Fairfax County. This amendment, passed in 1887, directed the transfer of the boundary of the section of land then called "the colored settlement" to outside the corporate limits of the town.23 Since 26 percent of the black males voted Republican the boundary change gerrymandered the territory in favor of the remaining Town voters who were mainly Democrats.24"
Ref 23 is the law
Ref 24 is "Stepping Stones on the Trail Through Falls Church", Maurice Terman 1995