Because many of them are from the Spanish perspective and not the perspective of the Aztecs. Cortes and his men started a war in the empire effectively destroying it, they claimed the Aztecs were inferior and people believed them. This is only because they didn’t see the aztec side of the story.
In the late 1800s, American cities suffered from serious environmental pollution due to the smokestack emissions from hydroelectric power plants. The correct answer is D.
