From Ohio History Central
The Mexican War was a major conflict between the United States and Mexico from 1846 to 1848.
During the 1820s and the 1830s, thousands of Americans moved to Texas. In the early 1830s, the Mexican government enacted a series of laws designed to control the recent American immigrants to Texas. In 1836, Texans rose up against Mexico and secured their freedom. The Mexican government refused to recognize Texas' independence.
Approximately seven thousand Ohioans enlisted in the United States army during the Mexican War. Most of these men served under Zachary Taylor in northern Mexico.