Most, you say, but not all. That would imply there are inhabitants here from multiple multiverses, some wholly without a Terran culture to speak of.

[ Entire realities lined up together, none of them related outside of their own possible variations. ]

Fascinating. Commander Shepherd, may I pose you notable historical events from the Earth I have come to familiarize myself with in an effort to discover whether our universes share the same lineage? I will keep my queries brief, should you desire.