I can’t speak for them, but please don’t use “Indian” word to refer indigenous Americans. The word “Indian” was given by Christopher Colombus, who thought he landed in India country but he got lost and landed in the “United States of America”. If you mentioned CC’s name to any indigenous Americans, they will tell you that CC was not a hero but a criminal. To know more about this, there are some videos on Youtube to explain why we shouldn’t use “Indian” word to refer to indigenous Americans.

Hello :) Commonly accepted the Term Indian refers to a Native Indian from India , and the American native Indians are referred to as 'Red Indians' , I am also Indian in Nationality but because I was born and live in South Africa , we are known as South African Indians.. So yes the context would be the relying factor. Hope This helps.. )

You might hear "American Indian" to refer to Native Americans, otherwise, yes, it's not clear without context. Typically "Native Americans," "Indigenous Peoples," or "First Nations" (in Canada) are used more often and are more accurate, but it depends generally on what people themselves would like to be called.