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by nine_k 1504 days ago
Europeans reached India around 330 BC, in the form of the armies of Alexander the Great. I won't say that India folded in the result; it's rather the Alexander's makeshift empire folded.

There were several meetings of civilizations of comparable level of advancement and strength on Earth. I posit that in space it's significantly less probable, unless we consider these civilizations to also be sisters, all humanoids coming from a common source, like these of Earth.