1900 Galveston hurricane - Wikipedia

On September 8, 1900, 6,000 people were killed when a hurricane & tidal wave struck Galveston, Texas. From the article:

"The Great Galveston Hurricane,[1] known regionally as the Great Storm of 1900,[2][3][4] was the deadliest natural disaster in United States history, and one of the deadliest hurricanes to affect Canada. The hurricane left between 6,000 and 12,000 fatalities in the United States; the number most cited in official reports is 8,000. Most of these deaths occurred in the vicinity of Galveston after storm surge inundated the entire island with 8 to 12 feet (2.4 to 3.7 m) of water. In addition to the number killed, every house in the city sustained damage, with at least 3,636 destroyed. Approximately 30,000 people in the city were left homeless, out of a total population of nearly 38,000. The disaster ended the Golden Era of Galveston, as the hurricane alarmed potential investors, who turned to Houston instead. The Gulf of Mexico shoreline of Galveston island was subsequently raised by 17 ft (5.2 m) and a 10 mi (16 km) seawall erected."