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Content: Some native Americans in the mid-west became active in trading. The Plains Native Americans moved further west and into Mexico. In all situations, there was a loss of tribal lands and traditional way of life. Explain why events in Mexico were also important to the United States. When Mexico won independence from Spain, the United States was interested because Mexico now wanted to develop trade with the United States. Also, as the United States expanded, it came into conflict with the northern Mexican territories. How did the boundaries change between Mexico and the United States after the Mexican-American War? Shortly before the Mexican-American War, the United States acquired Texas. After the Mexican-American War, the United States took over the land that includes California, Arizona, New Mexico Utah, and Nevada. This secured the American boundaries from coast to coast.