单项选择题
What occurred during the four centuries of attempted European conquest in the Americas merely extended the continuum of history into a new arena. The successes of these new arrivals and their descendants, consistent with the Line historical tendencies in human behavior, came at the expense of people whose kinship-based tribal system still operated on communitarian, if exclusive,
principles. Only the tribes of the southern hemisphere had become fully settled and had entered into their own era of empire-building. Unfortunately, the European people had achieved both technological and organizational superiority as these characteristics applied to the art of warfare whereas the tribes of the southern hemisphere had numbers in their favor but had no time for the adoption of European weaponry or strategy, a situation that contrasted sharply with that in North America where the tribes gained considerable access to modern weapons and were more flexible in their strategies. The two most important advantages the European-Americans possessed in the north was the endless stream of migration that more than replaced the population lost during warfare,and a production system centered in large and relatively secure population centers.
A、 They possessed a larger population to replace casualties in their conquest of North America than they did in the South.
B、 They had already gained experience in the Southern conquest that was not formerly available.
C、 They had access to weaponry superior to that which was employed in the Southern conquest.
D、 They were confronted by an opponent experienced in empire-building in North America.
E、 They had better martial organization in North America than they had in South America.