Graham sought his fortune in Rapides Parish in central Louisiana shortly after his marriage, farming cotton using enslaved labor. In 1823 his father invested in a cotton plantation with Louisiana's U.S. Senator (but usually referred to as Judge)
Josiah S. Johnston. Johnston arrived in Washington that November, leaving overseers in charge of the plantation. George Graham sent 80 Negroes to Louisiana from those he owned at "Graham's Station" in
Lewis County, Kentucky. Mason Graham took charge of the Louisiana plantation in 1828 and returned to Washington the following July, after replacing the overseers. However, while still en route to the national capital, in Columbus, Ohio, Mason Graham learned his father had died. Mason Graham then administered his father's estate in both Washington and Louisiana, knowing that the arrangement with Judge Johnston had never been committed to writing. However, good harvests in 1830 and 1831 enabled the younger Graham to buy out Johnston, then he sold that plantation to a neighbor who was a factor in New Orleans. Graham used the proceeds to buy the plantation of the late Charles T. Scott, and when his stepmother arrived, sold her children's slaves at her request. They were the progeny of "Codger", whom their grandfather George Brent had bequeathed to Sarah Brent, who in turn bequeathed them to her sister Jane Graham's children (although those that were bequeathed to Major Richard Graham had been transferred first from Graham's Station in Lewis County, Kentucky to the Florisante Valley near St. Louis when he ended his military career and became the Indian agent near St. Louis). By 1830, Mason Graham owned 112 enslaved people. John Grahams' son sent additional slaves from Graham's Station in Kentucky to Louisiana in November 1834, about a month after Mason Graham had returned to the national capital to marry. After this new wife's death in December 1835, Graham and his infant son mostly lived in the national capital, but spent winters in Louisiana. Two decades later, in 1850, Mason owned 87 enslaved people. Meanwhile, in January 1842, Graham partnered with General Sprigg to buy Tyrone Plantation on Bayou Rapides. He returned to live mostly in Louisiana, and began a political career as an Adams and Clay
Whig. Mason Graham attended the party's state and national political conventions, but voted against Mr. Watkins Leigh of Virginia, Clay's chief supporter. When war with Mexico over Texas loomed, General Taylor requested a militia brigade from Louisiana's governor. Graham recalled his military training and immediately ordered recruiting posters printed. He became the captain of the Rapides Horse Guards in 1843, which went to New Orleans to receive orders from Governor Isaac Johnson, which mustered them into service despite confusion over whether their service term was six or three months. They embarked for Point Isabell on May 11, 1843, only to find the fighting already over. Nonetheless, re-enlisting, they were transported to join Colonel (later Brigadier) John Garland's regular troops, then participated in the
Battle of Monterrey. Afterward, Graham learned his cousin Lt. R.H. Graham had been mortally wounded in the battle, and he himself suffered from jaundice and so returned to Louisiana, only to find that General Sprigg's successor, Captain Mulhollon, had died and left only 80 bales of cotton from 500 acres and . In 1853, Graham accepted Governor Hebert's appointment to the Board of Trustees of a proposed Seminary of Learning near
Pineville in Rapides parish. However, despite transforming the governing body to a Board of Supervisors, buildings were not erected for many years notwithstanding state expenditures of more than a half million dollars. Thus in 1859, Graham suggested the board model the facility on the U.S. Military Academy at West Point, and following the suggestion of Major John Carlos Buell (who had married the widow of his youngest half brother, General
Richard Barnes Mason), and despite opposition hired Major
William T. Sherman as headmaster. However, the American Civil War intervened, and Graham resigned from the educational board and spent some time in Virginia. In 1866 Governor James Madison Welles appointed Mason Graham as Adjutant General of Louisiana, heading the new militia. Graham also rejoined the educational board after 1872, when he partly resided in Louisiana, and returned to full involvement in the educational board from 1878 until 1885, when he resigned because of infirmity. He also was a candidate (though he never campaigned) for Congress, and lost to John E. King of St. Landry Parish. Thus, following the American Civil War, Graham established a seminary and military academy in, which would eventually move to Baton Rouge, Louisiana and become
Louisiana State University. It was said that “beyond family and intimate private affairs there was nothing closer to his heart than Louisiana State Seminary of Learning.” He died on January 31 1891 at 83 ==Notes==