author
1876–1936
A historian of the American West and early United States, he wrote closely researched studies on borders, settlement, and political life. His work helped bring episodes like the Louisiana Purchase boundary disputes and the southwestern frontier into sharper focus for later readers.

by Herbert Eugene Bolton, Thomas Maitland Marshall
Born in 1876, Thomas Maitland Marshall was an American historian whose work centered on western and southwestern history. He is best known for books including The Southwestern Boundary of Texas, 1821–1840 and A History of the Western Boundary of the Louisiana Purchase, 1819–1841, studies that show his interest in how borders, diplomacy, and expansion shaped the United States.
Marshall also wrote on mining law and edited historical materials, including The Life and Papers of Frederick Bates. Sources from university and archival collections describe him as a professor of history at Washington University in St. Louis, and his publications suggest a scholar who was especially drawn to the documentary record behind political and territorial change.
He died in 1936. Though not a household name today, his books remain useful for readers interested in the early American frontier, the Southwest, and the contested lines that defined the nation’s growth.