Robert Todd Lincoln was an American lawyer and businessman. The eldest son of President Abraham Lincoln and Mary Todd Lincoln, he was the only one of their four children to outlive his parents. Robert Lincoln became a business lawyer and company president, and served as both United States Secretary of War (1881–1885) and the U.S. ambassador to Great Britain (1889–1893).

Abraham Lincoln was an American lawyer, politician, and statesman, who served as the 16th president of the United States, from 1861 until his assassination in 1865. Lincoln led the United States through the American Civil War, defending the nation as a constitutional union, defeating the insurgent Confederacy, playing a major role in the abolition of slavery, expanding the power of the federal government, and modernizing the U.S. economy.