The North American Free Trade Agreement came into force in 1994.
Its effective date was 1 January 1994, following negotiations among Canada, Mexico, and the United States. NAFTA created a trilateral free-trade framework intended to reduce tariffs, remove other barriers to commerce, and encourage investment across North America.
The agreement grew out of the 1988 Canada–United States Free Trade Agreement. U.S. President George H. W. Bush, Mexican President Carlos Salinas de Gortari, and Canadian Prime Minister Brian Mulroney negotiated the expanded pact. U.S. President Bill Clinton signed its implementing legislation in December 1993.
The year 1993 is a common wrong answer because the agreement was approved and implemented legislatively that year. NAFTA remained in force until 1 July 2020, when it was replaced by the United States–Mexico–Canada Agreement, commonly called USMCA.