By Michael Tedder Caesars, MGM, and Resort World have brought back an important part of the Las Vegas experience. Shortly after Nevada legalized gambling in the 1930s and the construction of the Hoover Dam brought both economic prosperity and an ineffable sense of 20th century modernism to the region, Las Vegas assumed its rightful role as America’s ID. Much of the country’s sense of post-World War II glamor comes from images of Frank Sinatra and Dean Martin performing, and partying, at iconic venues and casinos such as Caesars Palace, and the rest of the country wanted in on the fun. In the ’…