Alcoholics Anonymous (AA) publish the first edition of their "Big Book", which introduced the twelve-step program.

Alcoholics Anonymous (AA) is a global, peer-led mutual-aid fellowship focused on an abstinence-based recovery model from alcoholism through its spiritually inclined twelve-step program. AA's Twelve Traditions, besides emphasizing anonymity, stress lack of hierarchy, staying non-promotional, and non-professional, while also unaffiliated, non-denominational, apolitical and free to all. As of 2021, AA estimated it is active in 180 countries with an estimated membership of nearly two million—73% in the United States and Canada.

Alcoholics Anonymous: The Story of How More Than One Hundred Men Have Recovered from Alcoholism is a 1939 basic text, describing how to seek recovery from alcoholism. The Big Book was written by William G. "Bill W." Wilson, one of the founders of Alcoholics Anonymous, with the help of various editors. The composition process was not collaborative other than editing. Bill wrote all of the chapters except for "To Employers" which was written by Bill's right-hand man, Hank Parkhurst. Parkhurst influenced the more liberal notions of "God as we understand him" and "your own conception of God." Drafts of sections were sent back and forth between Bill W.'s group in New York and Robert Holbrook Smith, the other AA founder, in Akron, Ohio. Dr. Bob made no major changes. It is the predecessor of the seminal "twelve-step method" widely used to treat many addictions, from alcoholism, heroin addiction and marijuana addiction to overeating, sex addiction and gambling addiction, with a strong spiritual and social emphasis. It is one of the best-selling books of all time, having sold 30 million copies. In 2011, Time magazine placed the book on its list of the 100 best and most influential books written in English since 1923, the year in which the magazine was first published. In 2012, the Library of Congress designated it as one of 88 "Books that Shaped America."