Is the United States the only place that considers mixed people black?

The majority of African Americans are not full black or 100 percent. And then to make matters more extreme, a lot of people consider biracials as black people.

Is that why particular Latinos with a ton of African ancestry nearly have a spasm when an American calls them a black person?
Update: You Can't Block: Well that would be an ethnicity issue, not a racial one. Most Afro-Latinos do everything in their power to claim that they're mixed "race," and nearly have stroke if you call them a black person.
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