Alexander McKenzie Buchanan (March 1, 1805 – August 26, 1868) was a justice of the Louisiana Supreme Court from May 4, 1853, to May 6, 1862.
Born in New York City, Buchanan read law in the office of Louisiana Supreme Court Justice Isaac Trimble Preston, gaining admission to the bar in 1826. Buchanan was a judge of the Fourth District Court before his ascension to the supreme court bench.Celebration of the Centenary of the Supreme Court of Louisiana (March 1, 1913), in John Wymond, Henry Plauché Dart, eds., The Louisiana Historical Quarterly (1922), p. 118. He later served as the city attorney for New Orleans from 1867 to 1868.
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