NAFTA was the largest free trade agreement in the world when it was established on January 1, 1994. NAFTA was the first time that two industrialized countries had signed a trade agreement with an emerging country. In its May 24, 2017 report, the Congressional Research Service (CRS) wrote that the economic impact of NAFTA on the U.S. economy was modest. In a 2015 report, the Congressional Research Service summarized several studies as follows: “In reality, NAFTA did not cause the huge job losses that critics feared, nor the significant economic benefits predicted by supporters. The overall net effect of NAFTA on the U.S. economy appears to have been relatively small, not least because trade with Canada and Mexico accounts for a small percentage of U.S. GDP. However, there have been adjustment costs for workers and businesses as the three countries have prepared for more open trade and investment between their economies. :2 One of the agricultural sectors most affected was the meat industry. In 2004, Mexico moved from a small player in the U.S. export market to the second largest importer of U.S. agricultural products, and NAFTA may have been an important catalyst for this change.
Free trade has removed barriers to business between the two countries, allowing Mexico to offer a growing meat market in the United States and increase sales and profits for the meat industry in the United States. A simultaneous and dramatic increase in Mexican GDP per capita has significantly changed meat consumption patterns due to increased per capita meat consumption.  Democratic candidate Bernie Sanders, who opposed the Trans-Pacific Partnership trade agreement, called it “the continuation of other catastrophic trade agreements such as NAFTA, CAFTA and normal, sustainable trade relations with China.” He believes that free trade agreements have led to the loss of American jobs and lower U.S. wages. Sanders said America needs to rebuild its production base with U.S. factories for well-paying jobs for the U.S. workforce, instead of relocating to China and elsewhere.    NAFTA was supplemented by two other regulations: the North American Agreement on Environmental Cooperation (NAAEC) and the North American Agreement on Labor Cooperation (NAALC).
These tangential agreements should prevent companies from moving to other countries in order to use lower wages, more moderate health and safety rules and more flexible environmental rules. The North American Free Trade Agreement (NAFTA), which came into force in 1994 and created a free trade area for Mexico, Canada and the United States, is the most important feature of bilateral trade relations between the United States and Mexico.