"First Purchase African M.E. Church was in the Quarters outside the southern town limits"

The church visited and belonging to the African-American population of Maycomb was called "First Purchase" as freed slaves used their first earnings to pay for it to be built.  

After slavery was abolished, freed blacks established separate congregations and church facilities, creating communities and worshipping in culturally distinct ways. They had already created a unique and empowering form of Christianity that creolized African spiritual traditions. Segregationist attitudes discouraged or, in the South, actually prevented African-Americans from worshipping in the same churches as whites.