Abraham Lincoln

Before becoming the sixteenth President, Abraham Lincoln was a highly successful trial lawyer who practiced in Illinois for nearly twenty-five years. Self-taught from reading Blackstone's Commentaries and other legal texts, Lincoln was admitted to the bar in 1836 and built a reputation as a formidable courtroom advocate known for his plain-spoken eloquence, devastating cross-examinations, and mastery of legal reasoning.

Lincoln's legal career was remarkably diverse. He handled thousands of cases ranging from debt collection to murder trials, railroad disputes to patent litigation. He argued over 300 cases before the Illinois Supreme Court and one case before the U.S. Supreme Court. His most famous trial was the 1858 murder case of Duff Armstrong, where he used a judicial notice of an almanac to undermine a prosecution witness's claim of witnessing the crime by moonlight.

As president, Lincoln drew heavily on his legal training. The Emancipation Proclamation was crafted as a legal document—a military order issued under the president's war powers. His interpretation of executive authority during the Civil War, his management of constitutional crises, and his vision for Reconstruction all reflected the habits of mind he developed as a practicing lawyer.