How big was Texas in 1845?

In 1845, Texas was an independent republic that covered approximately 389,000 square miles, making it one of the largest states in the U.S. It included the territories of present-day Texas, parts of New Mexico, Oklahoma, Kansas, Colorado, and Wyoming. Texas was annexed to the United States in December 1845, becoming the 28th state. The vast size of Texas at that time contributed to its significant resources and strategic importance.