Either the Crusades or Polo's journeys.
I am pretty sure that the following which was the main benefit to the spread of disease in the New World for the colonists is being revealed by the option : “Limited number of Natives available to fight back against the colonists”. I choose this one because that was the point which led Natives to show their weakness and captured by the colonists.
Hoope it helps!
Él los ayudó haciendo el suelo fértil para la agricultura.
D.) United Nations, because the league of nations was ineffective and basically caused WWII
have a nice day <3
Answer
Taking land, mass murder, or just plain kicking them out.
Explanation:
you take your pick