Centralist Republic of Mexico
The region of the Mexican state of Coahuila y Tejas, now commonly referred to as Mexican Texas, declared its independence from Mexico during the Texas Revolution in 1835–1836, when the Centralist Republic of Mexico abolished autonomy from states of the Mexican federal republic. The major fighting in the Texas war of independence ended on April 21, 1836, but the Mexican Congress refused to recognize the independence of the Republic of Texas, since the agreement was signed by Mexican President General Antonio López de Santa Anna under duress as prisoner of the Texians. There were intermittent conflicts between Mexico and Texas into the 1840s. The United States recognized the Republic of Texas in March 1837 but declined to annex the territory.