Because the winners write the history. It was a hugely important battle but the final die was cast for the Confederacy less than two months early when Grant began the siege of Vicksburg. Once the city fell, the day after Gettysburg no path to victory remained.
Washington Dulles IAD Airport Overview. Washington Dulles International Airport IAD is the larger of two major Washingon, D.C. airports and handles both domestic & international air traffic. (While Dulles Airport is actually situated in Virginia, Reagan National Airport is within short reach of the Nation's capital Washington D.C.)
Although most U.S. airports use the same three-letter location identifier for the FAA and IATA, this airport is assigned BBG by the FAA and BKG by the IATA (which assigned BBG to Butaritari Atoll Airport in Butaritari, Kiribati).