I remember in an old history/politics class there being mentioned that voters had to pass competency tests to vote in the 19th century? What did these tests entail?

by mystical-me

More specifically post civil-war in the North

FerdinandoFalkland
Elan-Morin-Tedronai

The other answer is nice, but does anyone have a test not specifically designed to disenfranchise specific races? Literacy requirements did exist in places other than the American South.