What part of the agenda of southern democrats most directly affected african americans?

The South’s support of slavery and readiness to use fear and violence to maintain it. The southern states were plantation states, consisting of large work forces of African-Americans who were brought over to north America by slave-traders. Slaves were a part of the southern economy, and the effort to free them by the northern states led to a civil war

Or more simple answer would be They used fear to promote.

advertising coaxes people to buy new products

do you have a list of sources to choose from?