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Answer:
The citadel is important, because it has a great archaeological value and a variety of ecosystems. Machu Picchu symbolizes the excellent technical skill, and productivity of the Inca Empire in its apogee.
Explanation:
In August of 1963, representatives of the United States, Soviet Union, and Great Britain all signed the "Limited Nuclear Test Ban Treaty." This treaty limited/prohibited the testing of nuclear weapons in outer space, underwater, or anywhere in the atmosphere.