Final answer:
The most notable enforced political union of the last 40 years is the European Union (EU), augmented by the North American Free Trade Agreement (NAFTA) aimed at reducing trade barriers between the U.S., Canada, and Mexico.
Step-by-step explanation:
Though now disbanded, the most notable enforced political union of the last 40 years is the European Union (EU). Formed in 1992, the EU dramatically integrated the economic activities of its member states and provided increased freedom of movement for work and travel within its borders. Among key events, the signing of the North American Free Trade Agreement (NAFTA) in 1993 stands out as it sought to eliminate trade barriers between the United States, Canada, and Mexico, fostering stronger economic ties within North America as a response to the EU's formation. Additionally, other trade agreements and blocs like the General Agreement on Tariffs and Trade (GATT), MERCOSUR, the Association of Southeast Asian Nations (ASEAN), and the Asia-Pacific Economic Cooperation (APEC) emphasize the global trend towards economic supranationalism and regional integration.