Republic of Texas

The Republic of Texas (Spanish: República de Tejas), or simply Texas, was a short-lived sovereign country in North America from March 2, 1836, to February 19, 1846. Texas was bordered by Mexico to the west and southwest, the Gulf of Mexico to the southeast, the two U.S. states of Louisiana and Arkansas to the east and northeast, and U.S. unorganized territory encompassing parts of the current U.S. states of Oklahoma, Kansas, Colorado, and Wyoming to the north. The Texas Revolution began when hostilities broke out on October 2, 1835, shortly before the regime of Mexican President and General Antonio López de Santa Anna adopted a new Mexican constitution known as the Siete Leyes that abolished the authority of the states under the federal republic and established a centralized government. The revolution lasted for over six months. On March 2, 1836, delegates in convention proclaimed the Texas Declaration of Independence. Major fighting ended on April 21, 1836, with the Treaties of Velasco that ended the fighting and secured Texas' independence.

The Mexican Congress refused to recognize the independence of the Republic of Texas, as the Treaties of Velasco were signed by Santa Anna under duress as prisoner. The majority of the Mexican Congress did not approve the agreement. Much of its territory was controlled and disputed by Mexico or the Comancheria; Mexico considered it a rebellious province during its entire existence. The Anglo-American residents of the area and of the republic were referred to as Texians, while Texans of Mexican descent were referred to as Tejanos.

Having gained independence following the revolution, Texas engaged in complex relations with various countries. European powers (France and Britain), along with the United States, hesitated to recognize the new republic, in deference to established relations with Mexico. Over time, they eventually recognized Texas and adopted trade relations. Intermittent conflicts between Mexico and Texas continued into the 1840s.

Texas was annexed by the United States on December 29, 1845, and was admitted to the Union as the 28th state on that day, with the transfer of power from the Republic to the new state of Texas formally taking place on February 19, 1846. However, the United States inherited the southern and western border disputes with Mexico, which had refused to recognize Texas' sovereignty or to accept U.S. offers to purchase the territory. Consequently, the annexation led to the Mexican–American War.