The term 'Indian Tribes American Montana' can be summarized by noting that the four-letter answer to this crossword is 'CREE'. The CREE are an indigenous people of North America, originally from the area of present-day Ontario and Quebec in Canada. They are one of the largest groups of First Nations in North America, with over 200, 000 members. In the United States, the CREE are found in Montana, where they are the second-largest tribe in the state.