There are many issues concerning U.$. and Kanadian imperialism where it is better to speak of a pan-indigenous struggle than to break it down into each First Nation. This becomes most evident when we see peoples of various First Nations lend each other aid in struggle or aid the struggles of other oppressed nations.
MIM's line is that the road of Martin Luther King is unrealistic, because it depends fundamentally on the generosity of the exploiters and oppressors. We oppose the countless social-democratic and Trotskyist organizations squelching the struggle to end oppression and exploitation with their plans of multinational unity with exploiters and occupiers, thereby giving a bad name to communism.
One of the main reasons that there is a First Nations proletariat is that some First Nations people have taken up an attitude of resistance and refuse to assimilate into the imperialists' economy, the same white man's economy and culture that carried out genocide wiping out most First Nations people in North America. There is also a First Nations lumpen-proletariat--people in unemployment and poverty so long that we cannot say that they are either petty-bourgeois or workers. At the same time, a large portion of the First Nations people have been corrupted by the super-profits of imperialism. It is these people serving as the stooges of u.$. imperialism and pushing counter-revolutionary assimilation of the First Nations people.
The road to proletarian liberation of the First Nations is tricky. Tradition is a resource to resist imperialism, but it can become a stifling attachment to the past. There is also a great difficulty in uniting First Nations against the oppressors when imperialism has its tentacles spread so far and wide.
Pan-indigenous struggle is also very important in that even bourgeoisified First Nation people may nonetheless be active in solidarity with indigenous peoples outside of North Amerika. The super-profits of imperialism pull in one direction, but the realities of millions of indigenous people globally pull in another.