Full Text of the 18th Amendment
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 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.
Note: Words in italics indicate provisions that were later dropped from the Constitution.
The "noble experiment" of Prohibition was instituted by this amendment, only to be repealed 14 years later by the 21st amendment. Source: U.S. Senate
Ratified on January 16, 1919, the Eighteenth Amendment prohibited the making, transporting, and selling of alcoholic beverages. Adopted at the urging of a national temperance movement, proponents believed that the use of alcohol was reckless and destructive and that prohibition would reduce crime and corruption, solve social problems, decrease the need for welfare and prisons, and improve the health of all Americans. During prohibition, it is estimated that alcohol consumption and alcohol related deaths declined dramatically.
But prohibition had other, more negative consequences. The amendment drove the lucrative alcohol business underground, giving rise to a large and pervasive black market. In addition, prohibition encouraged disrespect for the law and strengthened organized crime. Prohibition came to an end with the ratification of Amendment XXI on December 5, 1933. Source: Annenberg Classroom