McCLELLAND, Robert, statesman, born in Greencastle, Pennsylvania, 1 August, 1807; died in Detroit, Michigan, 27 August, 1880. His father, John McClelland, was a physician of Philadelphia. The son was graduated at Dickinson in 1829, studied law, was admitted to the bar in 1831, and practised in Pittsburg for a year. In 1833 he removed to Monroe, Michigan, and in 1835 was a member of the State constitutional convention. He was a member of the legislature from 1838 till 1843, serving in the latter year as speaker, a, nd was then elected to congress as a Democrat, serving from 4 December, 1843, till 3 March, 1849. He was one of the eighteen Democrats that joined, with David Wilmot, of Pennsylvania, in passing the Wilmot proviso, which abridged the further extension of slavery into the territories of the United States. He was a deleg'ate to the National Democratic conventions of 1848, 1852, and 1868, and a member of the Constitutional conventions of Michigan of 1850 and 1867. He took an active part in the canvass that resulted in the election of General Pierce to the presidency. Mr. McClelland acted as provisional governor of Michigan in 1851, and was re-elected in 1852 for a term of four years, but resigned in 1853 to accept the post of secretary of the interior, which he held during President Pierce's administration.