What was one effect of the U.S. stopping the NAFTA Demonstration Project with Mexico?

Answer: A — Increase in tariffs.

One notable effect of the U.S. stopping the NAFTA Demonstration Project with Mexico was a significant increase in tariffs. When the project was halted, the cooperative trade policies and reduced tariffs that were part of the North American Free Trade Agreement (NAFTA) were negatively impacted. Without the demonstration project, the expectations for liberalized trade and streamlined processes in transportation and logistics were hindered. This led to a rise in tariffs as traditional trade barriers were reinstated. Higher tariffs typically make goods more expensive and can lead to reduced trade flows between the two countries. The cessation of the project highlighted the importance of continued cooperation and lower tariffs in facilitating trade, moving away from the open-market practices that were anticipated under NAFTA.