Andrew Donelson graduated second in his class from the US Military Academy at West Point and subsequently served as an aide-de-camp to Andrew Jackson in the US Army. After resigning from the military, he pursued a legal career and became private secretary to President Andrew Jackson. Donelson held diplomatic posts, including serving as chargé d'affaires to the Republic of Texas and minister to Prussia. He also played a role in the Democratic Party, assisting his uncle and helping James K. Polk win the presidential nomination. Donelson later transitioned to journalism, editing a Democratic newspaper, and eventually joined the Know Nothing Party, running for vice president on the Millard Fillmore ticket.

Andrew Donelson's political identity is marked by a blend of traditional Southern values and a willingness to adapt to shifting political landscapes. His support for Texas annexation and diplomatic roles in Prussia and revolutionary Germany highlight a strategic approach to foreign policy. Donelson's ownership of slaves and Southern sympathies contrast with his later political affiliations, such as running on the Know Nothing ticket, revealing a complex ideological positioning. His rhetorical style suggests an ability to navigate and reconcile these conceptual tensions.