Black americans built homes, inventions, and helped established america. what did africans do?

black americans built the u.s embassy,white house and also helped industrial resolution in america's early establishment plus we also invented a lot of inventions like the elevator,helicopter,a.c, doorknob,stove, almanac, first nuclear reactor, etc. blk americans also captured the west coast for white americans as well from the indians/mexicans. my point is what have africans done for this country and why do they come to this country and think theyre better than us black americans when we made it eligible for them to have civil rights here? if it wasnt for us their ugolie @sses wouldnt be able to achieve higher education. theyd be still in africa running around half naked in bikini flap, shooting spears at elephants wearing tribal paint fighting each other over 1 bowl of rice we americans sent to them. The average i.q for black americans is 85 while for africans it is 40. my point is what did africans invented that helped better the world or themselves? name me a famous invention from africans?