By 1919, California had become America’s leading winegrowing state with over 1,000 wineries in operation. On January 16th, 1919, with the ratification of the 18th Amendment to the Constitution everything changed. This was the beginning of the Prohibition Era in America - 1920-1933. It was not illegal to drink. Any wine, beer, or spirits in the possession of an American in 1920 could be enjoyed and consumed at home. The 18th Amendment and the Volstead Act stipulated that individual states should enforce Prohibition according to their own laws. Local law enforcement in San Luis Obispo County was vigilant, harsh and terrifying. People were arrested, jailed and paid large fines for making and selling wine.