I am quite aware of the implication of 'half-breed' and the definition of Metis and its origin (mixed; French, first used in Hudson Bay Company reports, ca. 1815).
The Metis Nation of Alberta, in their definition of "Historic Metis Nation," says it refers to "the Aboriginal people then known as Metis or Half-breeds who resided in the historic Metis Nation Homeland."
Is Canada the only country which has formally recognized people of mixed race and defined them as one of the "aboriginal peoples" (Constitution Act of 1982)?