What tactics did white southern democrats use to restrict or control black suffrage?

they lynched and sometimes killed blacks who tried to vote. they say blacks need to go back to africa but theyre the ones who brought us here. they say mexicans need to go back to mexico but California Arizona New Mexico were part of mexio until they took theyre land from them and made it america. they did the same thing to the native americans and native australians. they call veryody immigrants except themselves when their ancestors wronhfully took over america so white people are the only real illegal immigrants in america