ROBERT LINCOLN was the oldest son of Abraham Lincoln, and the only one to live to adulthood. He married Mary Harlan in 1868. The two separated in 1871 but later reconciled, and they ended up having three children together. Robert had his mother committed to an institution in 1875, and she never forgave him. Robert served as Secretary of War under Presidents James Garfield and Chester Alan Arthur, and later as U.S. Minister to the United Kingdom. In 1897, he joined one of America’s biggest corporations, the Pullman Palace Car Company; and he rose to become its President and Chairman of the Board. Late in life, Robert built a sprawling estate in Manchester, Vermont, where he passed away in 1926.