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A noticeable change in the conduct of global trade in the last few decades is that trade issues between countries are often replaced by trade issues between regions. What accounts for this change?
A. developing nations discouraging trade with developed nations.
B. the United Nations having the final authority over trade disputes.
C. the persistence of ethnic unrest, changing national boundaries, and widespread drought and disease
D. the formation of international trading blocs, such as North American Free Trade Agreement and the European Union
What is D. the formation of international trading blocs, such as North American Free Trade Agreement and the European Union