Abel Parker Upshur (1790–1844) was an American lawyer, judge, and politician from Virginia.
He was active in Virginia state politics and later served as secretary of the Navy and secretary of state during the Whig administration of President John Tyler.
He was the pseudonymous author of An Exposition of the Virginia Resolutions of 1798, a vigorous defense of state nullification.
Ludwig von Mises: "This, then, is freedom in the external life of manthat he is independent of the arbitrary power of his fellows. Such freedom is no natural right. It did not exist under primitive conditions. It arose in the process of social development and its final completion is the work of mature Capitalism." - Socialism