Short answers, pulled from the story.
The Chickamauga Mound dates back to the Upper Paleolithic period around 10,000 BCE. This site shows continuous human occupation through various eras including the Archaic, Woodland, and Mississippian periods.
In 1838, the U.S. government forced Cherokees and other Native Americans to relocate to Indian Territory in present-day Oklahoma during the Trail of Tears journey. The U.S. Army used Ross's Landing as one of three large internment camps where Native Americans were held before their forced westward migration.
Union artillery bombarded the city as a diversion and occupied it on the 9th of September 1863 following the Chickamauga Campaign. Major General Ulysses S Grant reinforced troops at Chattanooga and advanced to Orchard Knob against Confederate forces besieging the city on the 23rd of November 1863 when the Battles for Chattanooga began.
The same mountains surrounding the city trapped industrial pollutants that settled over downtown areas leading to federal government declaring Chattanooga had the dirtiest air in the nation during 1969. Local leaders launched Vision 2000 in the mid-1980s as an effort to revitalize and reinvent the culture and economy while population declined more than 10 percent throughout that decade before regaining it over the next two decades.
Chattanooga launched the first government-provided one-gigabit-per-second Internet service in the United States during September 2010 through the city-owned utility EPB. By September 2010, EPB became the first municipally owned utilities company offering internet access directly to public at speeds up to ten gigabit per second.