Blacks cannot take historical credit for building America because that never happened.
People say black negroid built America, that claim is totally false, the negroid didn't get off the boat with blueprints a tape measure and structural building skills hell the negroid even today doesn't have that skill set.
Blacks only did farm labor until some picked up skills from the white man and could work on more complicated tasks.
Even today in Africa the tribesman have yet to build a two story structure and without knowledge shared by white people the blacks would still be stuck in the stone age, nobody can dispute that.
The Chinese did a 100 times more work to build America than black people did and historical records can prove that 100%.