Final answer:
The U.S. did not introduce import substitution industrialization to the world's economic system; instead, it has focused on promoting free trade and economic openness, as exemplified by NAFTA and the post-World War II financial systems.
Step-by-step explanation:
The innovation that the United States did NOT introduce to the world’s economic system is import substitution industrialization (ISI), which is a strategy of economic development typically used by developing countries to reduce foreign dependency by replacing imported goods with domestically produced ones. In contrast, the U.S. and other successful economies have employed strategies that encourage free trade and economic openness. For instance, the North American Free Trade Agreement (NAFTA) among the United States, Canada, and Mexico is an example of the U.S. commitment to reducing trade barriers. Similarly, post-World War II financial systems, and the move away from the gold standard to trust-based currency valuation, have been influenced significantly by the U.S. These approaches focus on participating actively in world trade to attain a high standard of living, rather than isolating the economy and pursuing import substitution.