One current theory is that trade with Mesopotamia (which was very important to the Indus Valley civilization) slowed or stopped, due to Mesopotamia's own troubles at the time.
Most Americans were in the middle of happy but a little mad. It helped get Reagan elected because he was part of that.
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These terms may not have been the most appropriate because people, specifically Indians who discovered what we call America (we know them as American Indians/Native Americans). It was not a "New World" or "discovery" to anyone besides Christopher Columbus and his followers; people already knew about it. A term that may fit what he found better is "learning" or "exploration", but it is important to recognize that he did not find America himself.
Answer:
India, Malaysia, The Philippines, Indonesia, Singapore, Brunei, Cambodia and Laos.
