Over the following 10 yrs, investors started to make casinos inside the Nevada Desert. When the Hoover Dam was finished in 1936, settlement in that desert became more feasible. By the 1940’s, Las Vegas (30 miles through the Hoover Dam) started to see large-scale construction of casinos—typically with mob cash. https://elliotyfkmr.blogstival.com/35546392/the-best-side-of-las-vegas-history