Obama's dark skin in America

Barack Obama's mother was white , and he was raised by white people. Is he white or Black ?

There is a sense in which Obama was raised white but became Black by learning and moving to   Black people later in life.

Importantly, Obama is brown skinned ! He can't be white. It doesn't work both ways in the American system. Light skinned people can be Black, but dark skinned people can't be white. This asymmetry is the crux of the white supremacy here.