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" While Lee believed in slavery, he also profited from it far more than other army colonels. At the age of twenty-four, two years after graduating from West Point, Lee married Mary Custis, the only child of George Washington Parke Custis, the adopted son of George Washington. Custis earned his money through inheritance, and that inherited wealth derived from the work of enslaved labor. Enslaved labor created much of his wealth including the prestigious, Doric-columned Arlington House with its commanding view of the capital. Custis owned two other enslaved labor farms—Romancoke and White House.
A year after marrying Mary Custis, Lee inherited enslaved workers from his mother’s estate. During his many years in the army, Lee hired out those enslaved workers and pocketed the profit, creating wealth. By the time he wrote his only will as a U.S. Army officer in 1846 as he headed to fight in Mexico, he estimated his net worth at $40,000 in stocks, bonds, and property, including enslaved workers, or more than $1.3 million today. "
― Ty Seidule , Robert E. Lee and Me: A Southerner's Reckoning with the Myth of the Lost Cause