Attempt by one ethnic group to obliterate, physically or culturally, another.

That's your definition? based on ethnicity, with no mention of state actors and intent? That's good enough for a bar fight, but not much else.

I'd like to know what you think Canada and the US had changed in the CPPCG. I don't know what the pre-exisiting drafts said. I know that the US insists that the intent must be a "specific" intent, which is a cop-out, but I think the Convention as it stands now covers its actions against its native populations, but there's a lack of will to prosecute, which is a separate problem.