However, U.S. negotiators have been successful in concluding free trade agreements with the six nations in the Caribbean basin, as well as with Chile, Peru, Singapore, Australia, Bahrain, Morocco, Oman, Colombia, Panama and South Korea. Congress to give its approval The result was the General Agreement on Tariffs and Trade (GATT), founded in 1948, which was concluded immediately after the war. Their success led to further reforms and the World Trade Organization (WTO) was established in 1995. More and more countries have agreed on trade rules that are now almost global. They commit to the legally binding limits of their trade barriers and subsidies, which they have also negotiated. Democrats voted much more in favor of trade liberalization than Republicans, but were not consistent in their preferences. Mp Henry Rainey (D-IL) and members of Roosevelt`s government, Rexford Tugwell, Raymond Moley and Adolf Berle, were skeptical of tariff reductions during the Depression. However, the government decided to use a Democratic-controlled congress and presidency to impose the RTAA.
In 1936 and 1940, the Republican Party ran on a platform to lift tariff reductions guaranteed under the RTAA. But when they reclaimed Congress in 1946, they did not act to remove tariffs. In the years since the adoption of the RTAA in 1934, the economies of Europe and East Asia had been decimated by the violence of World War II, which left a huge global production gap filled by American exporters.  During the war, the United States had the highest positive balance in its history. Republican preferences for tariffs began to shift as exporters in the home districts began to benefit from stronger international trade. In the 1950s, there was no statistically significant difference between Republicans and Democrats on customs policy, a change that has lasted ever since.  Currently, the United States has concluded negotiations with 11 other countries (Australia, Brunei, Canada, Chile, Japan, Malaysia, Mexico, New Zealand, Peru, Singapore and Vietnam) for a regional trade agreement called the Trans-Pacific Partnership (TPP). The agreement is now awaiting approval from the U.S. Congress before it enters into force, and there is strong opposition to the agreement in Congress. In addition, most presidential candidates voted against the TPP or expressed strong reservations. If the agreement were to pass through Congress, the TPP would build on agreements already concluded by the United States with Australia, Canada, Chile, Mexico, Peru and Singapore, and would provide an important model for future negotiations with other Asia-Pacific countries and multilateral negotiations.
Although the WTO embodies the principle of non-discrimination in international trade, Article 24 of the GATT authorizes the creation of free trade zones and «customs unions» among WTO members. A free trade area is a group of countries that remove all tariffs on trade with each other, but retain their autonomy in setting their tariffs with non-members. A customs union is a group of countries that remove all tariffs on trade between them, while maintaining a common external tariff for trade with countries outside the EU (which is technically contrary to the MFN). Today, however, the prospects for further multilateral trade liberalization are uncertain. The Doha Development Round negotiations failed to reach an agreement after 15 years of effort. The United States, the European Union and Japan were not prepared to make substantial changes to current agricultural programs, and advanced developing countries – particularly India, China and Brazil – were not prepared to significantly reduce their industrial tariffs.