On March 26, 1874, publisher Condé Nast was born. A successful advertising executive for Collier's, he introduced the concept of "class publications" or "lifestyle magazines." While other publishers focused on circulation numbers, Nast targeted groups of readers by income level or common interest. Nast purchased Vogue in 1909 and House and Garden in 1913. In 1914, he introduced Vanity Fair. Each publication explored current...