San Antonio, Texas

1836 Battle of the Alamo: A small force of Texan defenders held the former Spanish mission for 13 days against Mexican General Santa Anna's army. All defenders were killed, but their sacrifice galvanized the Texas Revolution and led to independence at San Jacinto weeks later.

1718 Founding of the Spanish Missions: Franciscan friars established Mission San Antonio de Valero (later known as the Alamo) and four companion missions along the San Antonio River, creating the foundation of the city and the largest mission complex in North America.

1968 HemisFair '68 World's Fair: San Antonio hosted the World's Fair with the theme 'Confluence of Civilizations in the Americas,' attracting 6.4 million visitors. The fair produced the Tower of the Americas and catalyzed the River Walk's transformation into a world-famous attraction.

1921 Great Flood of 1921: A devastating flood killed 51 people and destroyed hundreds of buildings in downtown San Antonio. The disaster led to the creation of the Olmos Dam and the eventual channelization of the San Antonio River — which ultimately became the River Walk.

1941 Military Expansion in World War II: San Antonio's military installations expanded dramatically during WWII, with hundreds of thousands of soldiers training at local bases. The city earned its enduring title of 'Military City USA.'.

1842 Mexican Invasions of San Antonio: Mexican forces briefly recaptured San Antonio twice in 1842, demonstrating the fragility of the young Republic of Texas and prompting the disastrous Mier Expedition.

1877 Railroad Arrives in San Antonio: The Galveston, Harrisburg and San Antonio Railway connected the city to the national rail network, ending its frontier isolation and sparking rapid commercial growth.

1999 Spurs Win First NBA Championship: The San Antonio Spurs defeated the New York Knicks to win the first of five NBA championships, establishing one of the most dominant dynasties in basketball history under coach Gregg Popovich.

2015 Missions Named UNESCO World Heritage Site: The San Antonio Missions — including the Alamo — were designated a UNESCO World Heritage Site, the first in Texas, recognizing their extraordinary cultural significance spanning three centuries.

1939 River Walk Opens: Architect Robert H.H. Hugman's vision for a below-street-level pedestrian promenade along the San Antonio River was completed with WPA labor, creating what would become one of America's most visited urban attractions.