Prohibition devastated American restaurants by eliminating alcohol revenue that comprised 50-70% of total income, causing 25,000+ closures & 400,000+ job losses. Survivors adapted through entertainment integration, themed dining experiences, & elaborate non-alcoholic service while women opened 15,000+ tea rooms. Chain restaurants & automats expanded through operational efficiency, while underground speakeasies maintained illegal alcohol service. These adaptations established foundations for modern dining concepts including entertainment restaurants, ethnic cuisine expansion, & standardized chain operations that continue dominating contemporary restaurant markets.