Key Facts
- Duration
- March 2, 1836 – February 19, 1846
- Peak area
- ~1,007,935 km²
- Peak population
- ~70,000
- Admitted to U.S. as
- 28th state, December 29, 1845
- Independence declared
- March 2, 1836
Imperial Zenith Metrics
Territorial Scale Comparison
Peak area vs modern sovereign states
Historical Trajectory
Phase I: Rise
Tensions between Anglo-American settlers and the centralist government of Antonio López de Santa Anna sparked the Texas Revolution on October 2, 1835. After more than six months of fighting, delegates proclaimed the Texas Declaration of Independence on March 2, 1836. The decisive Battle of San Jacinto on April 21, 1836, resulted in Santa Anna's capture, and the Treaties of Velasco formally ended hostilities and secured Texas independence.
Phase II: Zenith
At its height the Republic claimed roughly one million square kilometers, including parts of present-day Oklahoma, Kansas, Colorado, and Wyoming, though much of this territory was contested by Mexico or controlled by Comanche-dominated lands known as the Comancheria. The republic established its own congress, presidency, and diplomatic relations, eventually winning recognition from the United States, France, and Britain, and developing trade ties that sustained its fledgling economy.
Phase III: Decline
Chronic financial difficulties, unresolved border disputes with Mexico, and ongoing military skirmishes weakened the republic throughout the early 1840s. Facing insolvency and the threat of renewed Mexican invasion, Texas accepted U.S. annexation, becoming the 28th state on December 29, 1845. The transfer of authority completed on February 19, 1846, but the unresolved border disputes the U.S. inherited precipitated the Mexican–American War later that year.
Notable Imperial Reigns
Selected rulers mapping the empire’s trajectory