Oh wow that’s a big step I wish luck to u
It would be first the Neolithic revolution that has happened during the prehistoric times. Next would be the Crusades when christian army tried to retake the Holy Land from the infidels and Muslims that they were fighting against. Lastly would be the Renaissance that means rebirth. Renaissance open the world into more possibilities and open the minds of the people.
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I would say we have better technology, so they can take part of the DNA and see when they were around. How long it's been since a dinosaur in the Triassic Era walked the earth.
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How to settle the western territories