The Battle of the Alamo (February 23 – March 6, 1836) was a pivotal event in the Texas Revolution, occurring as Mexican President General Antonio López de Santa Anna sought to reclaim Texas. The engagement began when approximately 1,500 Mexican troops marched into San Antonio de Béxar on February 23, initiating a campaign to retake the region. The Texians had established a garrison at the Alamo Mission with about one hundred soldiers, subsequently reinforced by around one hundred additional fighters led by James Bowie and William B. Travis, who became co-commanders of the defensive position.
The battle itself lasted thirteen days, culminating in a final assault on the early morning hours of March 6. The Mexican Army attacked the Alamo in successive waves; the Texians successfully repelled the first two assaults but proved unable to withstand the third attack. As Mexican soldiers scaled the walls of the mission, most Texian fighters withdrew into the interior buildings of the compound, where the engagement continued. Historians debate the exact details of the battle's conclusion, with William C. Davis positing on the basis of "perhaps" ten sources that three separate escapes of Texian combatants occurred, potentially involving as many as 80 men. Phillip Thomas Tucker similarly identifies three discrete Texian escapes totaling as many as 120 men.
The outcome of the siege resulted in Mexican reclamation of the Alamo Mission. Nearly all Texian combatants were killed during or immediately following the battle, making it a decisive victory for Mexican forces under Santa Anna's command. The engagement became a defining moment in the Texas Revolution and remains historically significant as a symbol of Texian resistance against Mexican military superiority.
The early republic period saw the United States move from the weak Articles of Confederation to the federal Constitution ratified in 1788, with the Bill of Rights added in 1791. George Washington served two terms as president (1789–1797), establishing precedents for executive authority, and the federal capital moved permanently to Washington D.C. in 1800. The Louisiana Purchase (1803) doubled the nation's territory for roughly $15 million, opening vast trans-Mississippi lands to American expansion. The War of 1812 against Britain ended inconclusively but produced a surge of American national identity and eliminated most British support for Indigenous resistance east of the Mississippi. The Northwest Indian Wars (1785–1795) and the Creek War (1813–1814) broke Indigenous confederacies that had resisted US expansion. The Missouri Compromise of 1820 temporarily balanced slave and free states as the nation expanded westward, but embedded the contradiction of slavery in every subsequent territorial debate.
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