The following excerpt is from Captain Cook's Journal. Would "The Maori suffered a loss of population and decline in power" be an accurate summary?
“It is not necessary here to follow the complicated history of New Zealand in later years, which unfortunately comprises [includes] several bloody wars with the Maoris. The present prosperous condition of this great colony is well known, but it has not been affected without the rapid diminution [decrease in number] of the natives, who have met with the fate of most aborigines in contact with Europeans, especially when the former were naturally bold and warlike.”
—Notes on Captain Cook’s Journal