National procedures for ratifying the agreement in the United States are governed by the legislation of the Trade Promotion Authority, which is also known as the fast-track authority. The negotiations focused « primarily on car exports, tariffs on steel and aluminum, as well as the milk, egg and poultry markets. » A provision « prevents any party from enacting laws that restrict the cross-border flow of data. »  Compared to NAFTA, the USMCA increases environmental and labour standards and encourages domestic production of cars and trucks.  The agreement also provides up-to-date intellectual property protection, gives the U.S. more access to the Canadian milk market, imposes a quota for Canadian and Mexican auto production, and increases the customs limit for Canadians who purchase U.S. products online from $20 to $150.  The full list of differences between USMCA and ALEFTA is listed on the Website of the United States Trade Representative (USTR).  On June 1, 2020, USTR Robert Lighthizer released the uniform rules, which are the final hurdle before the agreement is implemented on July 1, 2020. The text of the agreement is available here: ustr.gov/trade-agreements/free-trade-agreements/united-states-mexico-canada-agreement/uniform-regulations The North American Free Trade Agreement (NAFTA) is a treaty between the United States, Canada and Mexico; it came into force on 1 January 1994. (Since 1989, there has been free trade between the United States and Canada; NAFTA has extended this regime.) On that day, the three countries became the largest free market in the world – the combined economies of the three nations were $6 trillion and directly affected more than 365 million people. NAFTA was created to remove customs barriers for agriculture, manufacturing and services; Eliminating restrictions on investment protection of intellectual property rights. This should be done while respecting environmental and labour concerns (although many observers point to the fact that the three governments have been negligent in environmental and safety at work since the agreement came into force).