Under the U.S. Constitution, from an economic standpoint the United States is essentially a regional free trade bloc. No U.S. state government can establish a tariff on goods manufactured in another U.S. state. Recently, the U.S. government placed a 55 percent anti-dumping duty on cement imported from Mexico. Part 2 a. Major Mexican cement firms have responded by buying U.S. cement manufacturing operations in Texas and other states. A few of the Mexican firms have periodically transported some of the resources used to produce cement to those U.S. operations, manufactured cement, and sold the cement to customers throughout the United States. The Mexican firms are engaging in Part 3 A. a voluntary restraint agreement. B. voluntary import expansion. C. trade deflection. D. trade diversion