[quote=@Space Communist]
[quote]Still not nearly enough natives.[/quote]

Um, I think there would definitely be enough. Census data from 1980/81 suggests that there were about 1 million aboriginal Canadians and 6.5 million of the largest Mexican indigenous tribes alone. Taking just those numbers and adding them to the roughly 4 million native Americans in the US (that's accounting both single and multi-racial individuals), that's nearly 12 million people. A sixth of that could fight a war.

[quote]And the US and Canada detests each other. And Mexico is aligned to the Third International and ideologically split from the US and Canada. So a union in North America isn't possible, let alone a union of the native tribes.[/quote]

Understandable, what with the past two wars between Canada and the US. However, those are the governments of each country that hate each other. There are likely large masses of civilians that feel the same way, too, but I doubt the natives of each country do. Why? Because both have suffered in similar ways under their respective governments. They share a common enemy in the oppressive white man, and both share their heritage as the original people of the Americas. The same applies between both of them and the indigenous Mexican tribes.

Remember, it isn't the white/Hispanic populace we're talking about here; it's the natives that have been oppressed. While the warring white man may not be so friendly towards the others around him, the natives would be.

EDIT: Accidentally put 2 million for aborigines instead of 1 million.
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Firstly, Native Americans in Canada are still way on the minority in terms of Canadian demographics. They couldn't possibly muster the numbers required to fight the "ebil Europeans" occupying their land. Like-wise, Canada experienced a wave of immigration from England during its period of Civil War which facilitated the current status of the nation. So they're still way too much on the minority to be of any issue.

As well in Mexico, the indigenous customs of the pre-Colombian natives are much more infused with the Mexican identity than that of the US or Mexico which overtook native customs and culture and replaced it with their own anglo-European customs. Many Mexicans are already natives already and are not particularly concerned with native uprisings. Reason being: why rebel against yourself? Mexican aboriginal culture assimilated itself with European ideology pretty readily.

If we're going to consider Religion as being the qualifier for whether or not a Mexican is truly aboriginal or not than they'd be just as much in the minority. Catholicism and the minorities of other Christian thought (Protestants, Mormons) still lead over pre-Columbian faith.

When Spain colonized Mexico they didn't white-wash it by killing all the brown people and moving all the white people in as England and France did. They kept the natives. The only white appointments were the viceroys. But in the century or more since Mexico declared independence from Spain they've most likely balanced out its own government.

Post-independence Mexico managed to successfully create a pretty concept of common identity as "Mexican" between "Whites" (an honest minority) and everyone else. So no, they got no reason to rebel for native identity when for the last two hundred years they've managed to blur, smoothen, or remove much of it.