U.S. President Bill Clinton signs side deals to the North American Free Trade Agreement, September 1993.
Win McNamee / Courtesy Reuters

In the 20 years since it entered into force, the North American Free Trade Agreement has been both lauded and attacked in the United States. But to properly assess NAFTA’s record, it is important to first be clear about what the agreement has actually done. Economically speaking, the answer is a lot. By uniting the economies of Canada, Mexico, and the United States, NAFTA created what is today a $19 trillion regional market with some 470 million consumers. The U.S. Chamber of Commerce figures that some six million U.S. jobs depend on trade with Mexico and another eight million on

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