However, because of western colonists' persecution and massacre of Indians, Indian culture was absolutely destructed. As a result, the ancient civilisation's survival remained limited.
However, because of the Western colonists later persecution, killing Indians, the destruction of Indian culture, with the result that now the remnants of ancient civilizations materials is running out
however, as the western colonists persecuted and killed Indians and destroyed Indian culture, there is few remaining materials of its ancient civilization
虽然我英语不是很好,但我同意第二者的答案