Tijuana is known as a border city between Mexico and the USA. At the time of Prohibition and during World War II, Tijuana was infamous throughout the world as a den of iniquity, with seedy bars and red-light districts. Gambling, cockfighting and racetracks also flourished. Smuggling, drug trafficking and prostitution were an unavoidable side effect. The population exploded. U.S. tourists flocked en masse from San Diego across the border to Tijuana. The Mexican government deliberately looked the other way. Directly or indirectly, this development was certainly encouraged; after all, there was a lot of money to be made. And the local politicians also wanted to profit.