Indian and Mexican Wars
Lasted from Approximately 1816-1858
Volunteer armies were raised for the Florida Seminole Wars, Black Hawk War, Creek Wars and other conflicts
Ancestry has a database for Compiled Military Service Records for American Volunteer Soldiers,
Mexican War, 1845-1848.
Fold3 contains the index for CMSR’s (Compiled Military Service Records) and the Indian Wars Service Record Index.
Fold3 has digitized the Mexican War Service Record Index and has the full CMSR for Arkansas, Mississippi, Pennsylvania, Tennessee, Texas, and the Mormon Battalion
Mexican War Soldiers & Sailors Database
NARA (National Archives and Records Administration)
Military service records of soldiers who fought in volunteer organizations during the Mexican War are available here
Muster Rolls of Volunteer Organizations During the Civil War, Mexican War, Creek War, Cherokee Removal, and other Wars, 1836-1866, are available here.
The National Park Service’s Palo Alto Battlefield National Historical Park has information on more than 85,000 US and Mexican troops who served in the War.