In 1821, New MexicoCaliforniaTexasMexicoBattle of the AlamoSelect your answer had won its independence from Spain, and MexicoCaliforniaBattle of the AlamoNew MexicoTexasSelect your answer became a part of the new Mexican republic. That same year Mexico allowed Moses Austin to bring American settlers into Texas. Moses died before seeing his son, Stephen F. Austin, bring 300 families to Texas. Even though Mexico immigrationdefeatedprohibitedclaimedCaliforniaSelect your answer slavery, they allowed it in Texas because they wanted to encourage the American settlers. Conflicts arose when the American settlers in Texas ignored Mexican laws.

Texans were upset when Mexico outlawed slavery and stopped immigrationclaimedprohibiteddefeatedMexicoSelect your answer from the United States. In 1835, Mexico's president immigrationTreaty of Guadalupe HidalgoAntonio Lopez de Santa Annamanifest destinySelect your answer sent 1,400 Mexican troops to Texas. A volunteer Texas army was formed to fight off Santa Anna's troops. The Texas army was defeated at the immigrationBattle of the Alamomanifest destinyTreaty of Guadalupe HidalgoprohibitedSelect your answer. In April 1836, Sam Houston led the Texas Army on a surprise attack on Santa Anna near San Jacinto, where they defeatedimmigrationTreaty of Guadalupe HidalgoclaimedprohibitedSelect your answer the Mexican army. This led to Texas's independence from Mexico.

Sam Houston became the first president of the Republic of Texas, and Texas became a state in 1845. Mexico refused President Polk's offer to buy Treaty of Guadalupe HidalgoNew MexicoTexasMexicoCaliforniaSelect your answer and New MexicoBattle of the AlamoAntonio Lopez de Santa AnnaimmigrationTexasSelect your answer for $30 million and to establish the Rio Grande as the border between Texas and Mexico. In 1846, American troops led by Zachary Taylor marched across the Rio Grande and captured several Mexican cities. Battles were held in California and New Mexico, both were soon defeatedprohibitedAntonio Lopez de Santa AnnaclaimedimmigrationSelect your answer by the United States.

In 1847, General Winfield Scott led an American army into Mexico City and captured the fortress Chapultepec. The war ended in 1848 with the Treaty of Guadalupe HidalgoAntonio Lopez de Santa AnnaBattle of the Alamomanifest destinyimmigrationSelect your answer. Mexico agreed to the Rio Grande as its border with Texas and received $15 million for its territories. In 1845, journalist John O'Sullivan wrote about the right of the United States to claim new lands, which became known as Battle of the AlamoTexasmanifest destinyNew MexicoTreaty of Guadalupe HidalgoSelect your answer.