Charles Francis Adams, (born Aug. 18, 1807, Boston, Mass., U.S.—died Nov. 21, 1886, Boston), U.S. diplomat. The son of John Quincy Adams and the grandson of John Adams, he served in the Massachusetts legislature and edited a Whig journal. He helped form the antislavery Free-Soil Party and in 1848 was chosen its candidate for U.S. vice president. As ambassador to Britain (1861–68) he was instrumental in securing Britain’s neutrality during the American Civil War and in promoting the arbitration of the Alabama claims.
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