Final answer:
The Inuit are the largest group of aboriginal peoples in the Northwest Territories and Nunavut, with the Inuit comprising about 85% of Nunavut's population.
Step-by-step explanation:
The group of aboriginal peoples that has the largest population in the Northwest Territories and Nunavut is the Inuit. In Nunavut, which is the northernmost territory in Canada, the Inuit make up approximately 85 percent of the territory's population of around 35,000 residents. The Inuit have a significant presence in the Northwest Territories as well, although the specific percentage is less distinct compared to Nunavut. In contrast, the First Nations people make up over half of the population in the Northwest Territories, but this does not contest the numerical supremacy of the Inuit in Nunavut. With over 50,000 Inuit living in northern parts of Canada, they represent the predominant indigenous group in these regions, supporting their cultural continuity, language, which is Inuktut, and traditional livelihood.