Original sentence: Others died indirectly as a result of contact with introduced diseases for which they had no resistance.Over the next four centuries, European settlers would systematically displace Native American peoples, from the Arctic to South America.The long-term decimation, sometimes by government policy and sometimes not, of the natives of South and North America by Europeans is estimated to be one of the largest and longest in history.This was accomplished through varying combinations of warfare, the signing of treaties (of which the Natives may not have fully understood at times), forced relocations to barren lands, destruction of their main food supply -- such as the bison -- and the spread of European disease, notably smallpox
Edited sentence: Later European invaders systematically murdered additional Aboriginal people, from the Canadian Arctic to South America.Others died indirectly as a result of contact with introduced diseases for which they had no resistance....The long-term extermination, sometimes systematic, sometimes not, of the natives of South and North America by Europeans is estimated to be one of the largest and longest in history.They used warfare, death marches, forced relocation to barren lands, destruction of their main food supply -- the bison -- and poisoning