Final answer:
The three First Nation groups that lived and still live in the Canadian Shield are the Inuit, First Nations, and Métis.
Step-by-step explanation:
The three First Nation groups that lived and still live in the Canadian Shield are the Inuit, First Nations, and Métis. These groups are recognized by the Canadian constitution and are based on history, language, culture, and spiritual beliefs. The Inuit live in 53 communities in the northern parts of Canada, the First Nations represent over 630 groups from 50 Nations and languages, and the Métis live throughout Canada.