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John McKinley (May 1 1780 – July 19 1852) was a U.S. Senator from the state of Alabama and an associate justice of the United States Supreme Court.Born in Culpeper County Virginia his family moved to Kentucky when he was an infant. In that state he read law and was admitted to the bar in 1800 practicing in Frankfort and Louisville from 1800 to 1819 before moving to Huntsville Alabama.After serving in the Alabama House of Representatives he was elected to the U.S.