The document discusses various forms of cross-national cooperation and economic integration agreements. It describes the World Trade Organization (WTO) and its goals of facilitating open trade and adjudicating disputes between member nations. Regional economic integration aims to reduce or eliminate trade barriers between nations and can take the form of free trade areas, customs unions, common markets, or full economic unions with shared policies and currency. Examples discussed include the European Union, NAFTA, and various regional bodies in Asia, Africa, and elsewhere.