I personally think Russia bc their gov is sketchier than a pair of Skechers on a pedo , China bc they might enslave them or North Korea bc it's fvcking North Korea ლ( ಠ_ರೃ)
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Chances are they've already come and determined we are a str8 waste. So dumb and violent we wouldn't even make good slaves! Nevermind bestowing some of that advanced tech on us. Now... Ancient Aliens. The guys who built the pyramids and such. They witnessed a different kind of humanity. One that, at the time, had some potential. One that was worth investing in to a point. Later visits would confirm this to be false.