I'm a little annoyed by the comments, because it speaks of the lack of education on the term "black" itself. Black is an umbrella term for people of African descent (by blood, not colonist settlers) and/or those who possess dark skin, people of African descent exist all over the globe and were the indigenous people of many nations.
M's mother is canonically Algerian (and shown briefly with dark skin) and her father is of African descent. She's black.
Brazilians are black; due to colonization, trade, and encouraged importation of European people there are white/European Brazilians and there are Asian Brazilians too. Being Brazilian is a nationality and an ethnic group; people can possess the same nationality and possess different ethnic identities, as well as different racial identities. Sunspot is Brazilian with dark (not tan) skin, he's black.
As for indigenous people of the Americas and Australia. In early North America after the concept of race was introduced indigenous people of America were actually considered the same race as Africans, due to the fact Africans settled in N.A. and had several tribes. Later on colonists categorized the "red Indians" from the "black Indians." The same happened with Australia, there are aboriginals with dark skin and features shared with African people, and there those who don't. This applies to Gateway, he is black.
There are also people of African descent in China, Japan, UK, Russia, etc not just in Africa. So black is an umbrella term, and people who are identified as such consist of many ethnicities, nationalities, speak several languages, have many different religions, and have diverse skin tones, eye colors, and hair textures. ;)
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