I've always wondered about this:
People have been living in America for thousands of years. How come the ancient Romans and Greeks were so advanced and sophisticated compared to the Native Americans? They made entire cities and conquered half of Eurasia, while the Native Americans lived in small, simple tribes and had practically no knowledge of other lands. The Romans built the coliseum over two millennia ago, and yet, merely a half millennium ago, the Europeans came to America and found people who had no structures even close to those of the Romans. Why is this so?
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