In 1821, had won its independence from Spain, and
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
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.
Conflict Leads to War
Texans were upset when Mexico outlawed slavery and
stopped from the United States. In 1835, Mexico's
president 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
. In April 1836, Sam Houston led the Texas
Army on a surprise attack on Santa Anna near San Jacinto,
where they the Mexican army. This led to Texas's
independence from Mexico.
Statehood and War
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 and 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 by the United States.
The War Ends
In 1847, General Winfield Scott led an American army into
Mexico City and captured the fortress Chapultepec. The war
ended in 1848 with the . 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 .