 From 1890 to 1908, Southern states passed new state constitutions and laws that disenfranchised most blacks and tens of thousands of poor whites with new voter registration and electoral rules.When establishing new requirements such as subjectively administered literacy tests, in some states, they used "grandfather clauses" to enable illiterate whites to vote.The Five Civilized Tribes that had been relocated to Indian Territory (now part of Oklahoma) held black slaves and signed treaties supporting the Confederacy.