Core Legal Answer & Context: The General Agreement on Tariffs and Trade (GATT) was established in 1947 in the aftermath of World War II, as part of the Bretton Woods system, alongside the IMF and World Bank. Intended as a provisional agreement until the International Trade Organization (ITO) could be established, GATT became the de facto international body governing multilateral trade for nearly five decades. Its historical evolution involved a series of "rounds" of multilateral trade negotiations (e.g., Dillon, Kennedy, Tokyo, Uruguay Rounds) that progressively reduced tariffs and non-tariff barriers. This culminated in the Uruguay Round (1986-1994), which led to the creation of the World Trade Organization (WTO) in 1995, incorporating and expanding upon GATT's principles.

Relevant Statutes and Sections:

• General Agreement on Tariffs and Trade (GATT 1947): The foundational text.
• Marrakesh Agreement Establishing the World Trade Organization (1994): Superseded GATT 1947, incorporating GATT 1994 (an updated version of GATT 1947) as one of its core agreements.

Objectives of GATT:

• Trade Liberalization: To reduce tariffs and other barriers to international trade.
• Raising Living Standards: By promoting trade, to increase economic prosperity and improve living standards globally.
• Ensuring Full Employment: To contribute to full employment and a large and steadily growing volume of real income and effective demand.
• Optimal Use of World Resources: To facilitate the optimal use of the world's resources in accordance with the objective of sustainable development.

Main Principles of GATT:

• Most-Favoured-Nation (MFN) Treatment (Article I): Requires members to treat all other members equally. Any trade concession granted to one country must be immediately and unconditionally extended to all other GATT/WTO members.
• National Treatment (Article III): Requires imported goods, once they have entered a country, to be treated no less favorably than domestically produced goods with respect to internal taxes and regulations.
• Transparency (Article X): Requires members to publish their trade regulations and policies, making them predictable and accessible.
• Reciprocity: The idea that countries should offer concessions in return for concessions received, leading to a balanced reduction of trade barriers.
• Prohibition of Quantitative Restrictions (Article XI): Generally prohibits quotas and other non-tariff barriers, favoring tariffs as the only permissible form of protection (which are then subject to reduction).
• Tariff Bindings: Once a tariff rate is "bound" (committed to) in GATT/WTO negotiations, it cannot be raised above that level without compensation to affected trading partners.

Clear Conclusion: GATT successfully laid the groundwork for a rules-based multilateral trading system, significantly reducing trade barriers and fostering global economic integration. Its core principles of non-discrimination, transparency, and reciprocity remain fundamental to the WTO, which continues GATT's mission of promoting free and fair trade for global prosperity.