The beginnings of nightlife

From The Atlantic: "The nightlife that Americans know now, with dark restaurants and dance floors, did not exist until the 1920s. It's not that people didn't go out at night. But the way they went out, to saloons where women weren't welcome, to vaudeville shows, to balls and organized dances, wasn't anything like the way many go out at night today. … In New York, in the first couple decades of the 20th century, as the population boomed, all these activities started to concentrate at a new kind of establishment: nightclubs."