Answer: I think your answer is filtering, redacting, blocking, and censoring
This statement is completely true, the native peoples to the Americas were introduced to diseases such as smallpox which wiped out a majority of the populations. While battles and such took place this was a huge cause of change because of the effectiveness. Positively, however, the natives were also introduced to the trading of European goods such as foods, guns, and livestock, and particularly horses.
Brown v. Board made segregations in schools illegal.
This would make the answer B.
The comparison is that Nomadic hunters moved around a lot, as the early agriculture communities could stay in one place, and just farm.
The Thirty Years' War (1618-48) began when Holy Roman Emperor Ferdinand II of Bohemia attempted to curtail the religious activities of his subjects, sparking rebellion among Protestants.