It's simple it's taken way too long to realise they're of African descent. If I'm correct they started calling themselves afro-brazilians early to mid 2000.
Y'all be on some pro black shyt yet spend more time being hostile and divisive then you do on promoting unity. Quick to throw around c00n, bedwench/buck or whatever buzzword they got from Tariq Nasheed.
A lot of afro Brazilians are more steeped in African culture than those of us in the states. They go through the same things we do (poverty, drugs, incarceration, police brutality) and we should be trying to link up and strengthen our bonds with the diaspora wherever they are.