The Eighteenth Amendment (Amendment XVIII) of the United States Constitution effectively established the prohibition of alcoholic beverages in the United States by declaring the production, transport, and sale of alcohol (though not the consumption or private possession) illegal. The separate Volstead Act set down methods for enforcing the Eighteenth Amendment, and defined which "intoxicating liquors" were prohibited, and which were excluded from prohibition (e.g., for medical and religious purposes). The Amendment was the first to set a time delay before it would take effect following ratification, and the first to set a time limit for its ratification by the states. The requisite number of states had ratified it by January 16, 1919, with the amendment taking effect on January 16, 1920.
Section 1. After one year from the ratification of this article the manufacture, sale, or transportation of intoxicating liquors within, the importation thereof into, or the exportation thereof from the United States and all the territory subject to the jurisdiction thereof for beverage purposes is hereby prohibited.
Section 2. The Congress and the several States shall have concurrent power to enforce this article by appropriate legislation.
Section 3. This article shall be inoperative unless it shall have been ratified as an amendment to the Constitution by the legislatures of the several States, as provided in the Constitution, within seven years from the date of the submission hereof to the States by the Congress.
The Eighteenth Amendment was the result of decades of effort by the temperance movement in the United States and at the time was generally considered a progressive amendment. Starting in 1906, the Anti-Saloon League (ASL) began leading a campaign to ban the sale of alcohol on a state level. They led speeches, advertisements, and public demonstrations, claiming that banning the sale of alcohol would get rid of poverty and social issues, such as immoral behavior and violence. A well-known reformer during this time period was Carrie Amelia Moore Nation, whose violent actions (such as vandalizing saloon property) made her a household name across America.
Many state legislatures had already enacted statewide prohibition prior to the ratification of the Eighteenth Amendment but did not ban the consumption of alcohol in most households. By 1916, 23 of 48 states had already passed laws against saloons, some even banning the manufacture of alcohol in the first place.