One of the three sons of Samuel and Mary Donelson, Andrew Jackson Donelson was born in
Nashville, Tennessee. His younger brother,
Daniel Smith Donelson, would become the
Confederate brigadier general after whom Fort Donelson was later named. Donelson's father died when Donelson was about five. When his mother remarried, Donelson moved to
The Hermitage, the home of his aunt,
Rachel Donelson Jackson, and her husband, Donelson's namesake, the future US President
Andrew Jackson. Rachel and Andrew Jackson took care of all three Donelson sons, including Andrew. Donelson attended
Cumberland College, predecessor to the University of Nashville, in Nashville; joined the
US Military Academy at
West Point, New York; and graduated second in his class in 1820. His two years as an officer in the
US Army were spent as
aide-de-camp to Andrew Jackson, now a
major general who was campaigning against the
Seminoles in
Florida. After the campaign, Donelson resigned his commission and studied law at
Transylvania University, in
Lexington, Kentucky. A year later, he started to practice law in Nashville. ==Democratic politics==