What section of the united states was the most populous in the antebellum period

Antebellum is a Latin term that means "before the war." The antebellum period in the United States was the time period before the American Civil War, which began in 1861. It is most often described as the period between the War of 1812 and the Civil War, and it is most often used to refer to the Southern U.S. during that time period. Other historians might use the term "antebellum period" to refer to the entire U.S. and might consider it to have begun after the American Revolutionary War ended in 1789.