Checks and balance, a branch may use its power to check the other powers of the other two to maintain a balance of power among the three branches of government.
I don't know your passage, but I can give some general reasons why the Columbian exchange was a negative event for the Native Americans:
-this exchange included the introduction of many diseases to which the Europeans were immune,but which lead to a death of an estimated 80% of Native Americans
Answer: They didn't want soldiers in their homes. They started to feel bitter towards the act and even opposed it.
Answer is D.
Indentured servant were either catching diseases and dying, or leaving for other land.