What is the 18th Amendment?

The 18th Amendment reads in full: '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.' Congress proposed the amendment on December 18, 1917, and within thirteen months the required three-fourths of the then-48 states had ratified -- ratification was completed on January 16, 1919. The one-year implementation delay in Section 1 was inserted to give manufacturers, distributors, and retailers time to adapt to the prohibition; accordingly, the ban on manufacture, sale, and transportation of intoxicating liquors for beverage purposes took effect on January 17, 1920. Section 3's seven-year ratification deadline was the first time-limit ever included in a proposed constitutional amendment; it became a precedent that Congress has applied to many subsequent proposals, including the Equal Rights Amendment.

The 18th Amendment was the constitutional product of a temperance movement that had sought a national alcohol ban for most of the nineteenth century. The American Temperance Society, founded in 1826, was among the earliest national organizations. The Women's Christian Temperance Union, founded in 1874 and led for decades by Frances Willard, linked alcohol prohibition to women's suffrage and social reform. The Anti-Saloon League, founded in 1893, was the most effective political lobby for Prohibition; it operated at the state level, targeting 'wet' legislators for electoral defeat regardless of their other views, and secured state-level prohibition laws across much of the rural South and Midwest before pressing for a national constitutional amendment. By 1916, 23 states had enacted statewide prohibition laws and two-thirds of Americans lived under some form of local prohibition. World War I created additional impetus: grain conservation arguments made alcohol production seem wasteful during wartime, and anti-German sentiment added a nationalist dimension to the temperance case as many large breweries had German immigrant founders or owners. The combination of pre-existing state prohibition infrastructure, wartime sentiment, and the Anti-Saloon League's disciplined congressional lobbying produced the two-thirds congressional majorities needed to propose the 18th Amendment.

The primary enforcement statute under the 18th Amendment was the National Prohibition Act, enacted October 28, 1919, and commonly known as the Volstead Act after its chief congressional sponsor, Representative Andrew Volstead of Minnesota. President Woodrow Wilson vetoed the Volstead Act, arguing that wartime prohibition legislation (enacted in 1918) should be allowed to expire and that the proposed act exceeded what the 18th Amendment required. Congress overrode Wilson's veto on October 28, 1919 -- the same day he vetoed it -- and the Act took effect alongside the 18th Amendment on January 17, 1920. The Volstead Act defined 'intoxicating liquor' as any beverage containing more than one-half of one percent alcohol by volume, covering beer, wine, and spirits alike. It established criminal penalties for manufacture, sale, and transportation of such beverages, and created federal Prohibition agents within the Treasury Department to enforce those penalties. The Act included limited exceptions for sacramental wine, medicinal alcohol prescribed by licensed physicians, and industrial alcohol not intended for consumption. Section 2's concurrent enforcement power allowed states to pass and enforce their own stricter prohibition statutes, but it also meant that enforcement quality was uneven across jurisdictions.

The constitutional validity of the 18th Amendment and the Volstead Act was tested in litigation that reached the Supreme Court. In Hawke v. Smith, 253 U.S. 221 (1920), Ohio had held a popular referendum on the legislature's ratification of the 18th Amendment, relying on a state constitutional provision requiring referendum confirmation of legislative acts. The Supreme Court unanimously held that Article V of the federal Constitution prescribes the ratification process -- approval by state legislatures or conventions as Congress directs -- and a state may not impose an additional referendum requirement. Ohio was bound by its legislature's ratification regardless of the referendum result. In the National Prohibition Cases (Rhode Island v. Palmer), 253 U.S. 350 (1920), the Supreme Court upheld the 18th Amendment against seven consolidated constitutional challenges, ruling that Congress had the authority to propose the amendment, the two-thirds vote was properly counted, the concurrent enforcement power in Section 2 was constitutional and permitted states to enact stricter laws, and the 18th Amendment did not exceed the Article V amendment power. In United States v. Sprague, 282 U.S. 716 (1931), the Court rejected the argument that the 18th Amendment, because it affected the personal liberty of individual citizens, required ratification by state conventions rather than state legislatures. The Court held that Article V's choice between legislative ratification and convention ratification belongs to Congress, and Congress's selection of legislative ratification for the 18th Amendment was constitutional.

For the 2028 presidential election, the 18th Amendment is relevant primarily through the constitutional and historical lessons it contributed. First, the amendment demonstrated that a constitutional prohibition on conduct -- as opposed to a structural change in government -- could be enacted through the Article V amendment process. The constitutional mechanism by which the federal government regulates intoxicating substances today, however, is not the 18th Amendment (which was repealed in 1933) but the Commerce Clause of Article I, Section 8. The Supreme Court's decision in Gonzales v. Raich, 545 U.S. 1 (2005), held that Congress may apply the Controlled Substances Act's Schedule I marijuana prohibition to intrastate cultivation and possession because Congress had a rational basis for concluding that excluding such activity from a comprehensive regulatory scheme would undercut that scheme -- a broad Commerce Clause holding that governs modern federal drug law. Debates among 2028 candidates about federal marijuana scheduling, the Controlled Substances Act, and the relationship between federal prohibition and state-level legalization laws operate in this Commerce Clause framework, not under the 18th Amendment. Second, the 18th Amendment's repeal by the 21st Amendment is the only example in American constitutional history of one amendment entirely reversing another. The episode is cited in constitutional debates about whether other amendments -- such as the 22nd Amendment's presidential term limits -- could similarly be repealed through the Article V process. Third, the 18th Amendment's seven-year ratification deadline has been incorporated into most subsequent proposed amendments, including the proposed Equal Rights Amendment; debates about whether a ratification deadline is constitutionally binding remain active constitutional questions.