The book chronicles the early life and political development of Abraham Lincoln. Carl Sandburg's multi-volume biography delves into Lincoln's formative years, tracing his journey from humble beginnings on the Illinois prairie to his emergence as a significant figure in American politics. This volume focuses on his childhood, education, early career as a lawyer and politician, and the experiences that shaped his character and worldview.

This volume is widely regarded as a foundational text in Lincoln scholarship, praised for Sandburg's evocative prose and deep research. Critics have noted its comprehensive scope and its success in bringing Lincoln's early life to vivid life. The work is often cited for its literary merit as well as its historical accuracy. It provides essential context for understanding Lincoln's later presidency.