The story begins with Abraham Lincoln's early life, depicting his humble beginnings in a log cabin and his struggles for education and self-improvement. Motivated by his sense of justice and desire to make a difference, Lincoln starts his career as a lawyer and becomes involved in local politics. Despite facing numerous challenges, including personal tragedy and financial difficulties, Lincoln's innate charisma and unwavering determination earn him widespread respect. His passionate debates and speeches on issues like slavery and equality bring him into the national spotlight. The narrative emphasizes his relationship with Mary Todd, showcasing their courtship and the supportive partnership they eventually form.

As Lincoln rises to prominence, the nation is on the brink of civil war, threatened by deep-seated divisions over slavery and states' rights. His election as President precipitates the secession of Southern states and the formation of the Confederate States. Lincoln's resolve and leadership are put to the test as he navigates the complexities of leading a country at war. The portrayal focuses on his tireless efforts to preserve the Union, relying on his diplomatic skills and unwavering moral compass. The film portrays him grappling with the immense pressure of his decisions while striving to maintain his vision for a united and emancipated nation.