[2] Thomas moved to Alexandria, Louisiana in 1819 and resumed the practice of law.
He purchased vast tracts of land adjoining Alexandria and became one of the largest landowners and slaveholders in Louisiana.
While running a plantation, he engaged in mercantile pursuits and in the operation of sawmills and steamboats.
[3] Thomas returned to Alexandria, Louisiana, where he died on February 2, 1859 (age 74 years, 90 days).
He is interred at Flint lot, in Rapides Cemetery, at Pineville, Louisiana.