Robert Todd Lincoln (August 1, 1843 – July 26, 1926) 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 survive past 18 and also the only one to outlive both 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). Wikipedia
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