Edward Alden of CFR says the fear of trade deals has increased because wages have not kept pace with labour productivity, while income inequality has increased. To some extent, he says, trade agreements have accelerated the pace of these changes because they have “strengthened the globalization of the U.S. economy.” Many workers and union leaders blame trade agreements such as NAFTA for declining employment in U.S. production. The U.S. auto sector has lost about 350,000 jobs – one-third of the industry – since 1994, while employment in Mexico`s auto sector has grown from 120,000 to 550,000. President Donald Trump cried as he promised to repeal NAFTA and other trade deals he considered unfair to the United States. On August 27, 2018, he announced a new trade agreement with Mexico, which is expected to replace it. The U.S.-Mexico trade agreement, as has been said, would maintain duty-free access for agricultural products on both sides of the border and eliminate non-tariff barriers, while encouraging more agricultural trade between Mexico and the United States and effectively replacing NAFTA. The free trade agreement was concluded in 1988 and NAFTA extended most of the provisions of the free trade agreement to Mexico.
NAFTA was negotiated by the governments of U.S. President George H.W. Bush, Canadian Prime Minister Brian Mulroney and Mexican Prime Minister Carlos Salinas de Gortari. An interim agreement on the pact was reached in August 1992 and signed by the three heads of state and government on 17 December. NAFTA was ratified by the national parliaments of the three countries in 1993 and came into force on January 1, 1994. In July 2017, the Trump administration presented a detailed list of changes it wants to make to NAFTA.  The top priority was to reduce the U.S. trade deficit.   The government has also called for the abolition of provisions allowing Canada and Mexico to challenge U.S. tariffs and impose import restrictions on the United States, Canada and Mexico.  The list also highlighted subsidized state-owned enterprises and monetary manipulation.
  Sixth, the agreement provided business travellers with easy access to all three countries. The United States had a trade surplus with NAFTA countries of $28.3 billion for services in 2009 and a trade deficit of $94.6 billion (36.4% per year) in 2010. This trade deficit represented 26.8% of the total U.S. trade deficit.  A 2018 study on international trade published by the Center for International Relations identified irregularities in NAFTA trade patterns using network theory analysis techniques.