The river that is one of the two major waterways that feed into the Aral Sea is Amu Dar'ya. The correct answer is A.
Samuel Adams was a Founding Father of the United States and a political theorist who protested British taxation without representation, uniting the American colonies in the fight for independence during the Revolutionary War.
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A major impact of the Cuban Missile Crisis was that it brought the world dangerously close to nuclear war. This crisis showed that there was great potential for a nuclear armed conflict to potentially break out.
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.