Which us citizens were allowed to vote before 1820

In the course of illness senerational campaign against stephen douglas in1858 abraham declared that

Me a slaveowner who worked a slave to death or be a slave to death, a. cannot be tried for murder in criminal court but could be sued for wrongful death in the civil court b. cannot be tried in court because there was no law against the mistreatment of slaves. c. could have his form or plantation confiscated by the state and sold to the highest bidder. d. could be tried for murder in most southern states.

Which region of the country had more representatives in congress as of 1860