Imagination Exercise: what future historians will be baffled about if disclosure indeed happen?

I think this is a question that forces us to consider the core problems of the present UAP situation. For example, if we assume this hypothetical set of premises: 1) propulsion-less, faster-than-light, inertia-free "movement" is possible, as observed in UAP; 2) the military + IC of the strongest nations are aware of premise number 1 and have collected intelligence about it; 3) they kept it secret for 80 odd years; 4) at least the US did that through the Department of Energy`s bureaucracy; 5)...

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