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Halo takes place in Holy Terra's antiquity; the Dark Age of Technology:
Must Keep The Web IntactThe encounter with the Covenant and Floods where the first that mankind ever had with aliens, which explain the furious xenocidal nature of the Imperium(hey, maybe, just maybe, if the Imperium had nice first contacts with aliens, it might have turned out to be The Federation). Eventually the Ai rebels and leads an army of Iron men to destroy mankind, which also fits in 40k continuity. The Spartans where the ancestors of the Space Marine program.
The Great Northern Threadkill.
The system doesn't know you right now, so no post button for you.
You need to Get Known to get one of those.
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