On the Propensity of Indigenous Peoples to Migrate Closer and Closer to the Areas Most Intensively Colonized and/or Settled

  It even happened in North America as the Indians moved closer to the forts and other populated areas (for trade, largely) to the point of sometimes even waging war with other tribes to gain this proximity. Granted, things went considerably sideways for the Native Americans as unending stream white Europeans overwhelmed them on the plains and sociopaths like Sherman and Sheridan started leading the cavalry but, let's be real, in any clash of civilizations in which one side still lives in the stone age and doesn't have the requisite immunity from novel diseases the results are fully predictable.