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James DeWolf (March 18, 1764 – December 21, 1837) was a slave trader, a privateer during the War of 1812, and a state and national politician. He served as a state legislator for a total of nearly 25 years, and in the 1820s as a United States senator from Rhode Island for much of a term. Along with the slave trade, DeWolf invested in sugar and coffee plantations in Cuba and became the wealthiest man in his state. By the end of his life, he was said to be the second-richest person in the entire United States. During his lifetime, his name was usually written "James D'Wolf".