Egypt was brown and black. Babylon was brown and black. The Hebrews were brown and black. Persia was black and brown. The Moore who ruled Europe were black and brown. Carthage was black and brown. Mensa Mussa 'discovered' America before Columbus, who said Blacks existed in Americas. Also, Pacific Islands.
I understand the desire to honor one's ancestry. But to start to define how one group of people contributed more to the human race is purely supposition and speculation. Every civilization/ethnicity has contributed to human race. How do you even begin to define "contribute to history" and which contributions outweigh the other? Where do you even begin?
Was it the ancient Greek's with their quest for knowledge and philosophers? Perhaps the ancient Chinese who invented gunpowder, paper, printing, and the compass? Maybe it was Japan who their inventions of pottery, mass media, the novel. Perhaps abacus which a like the modern-day calculator. Was it America with its Apollo Lunar Space program, the cell phone, the computer. Maybe Europe with the mouldboard plough, the mechanical clock, penicillin, and eyeglasses. Africa with the discovery of mathematics, mining of minerals, with Ethiopia having first recorded Laws, ancient African philosophy.
I guess my point is that every nation of people has contributed to the advancement of mankind. That it's all interlocked like a chain, to say anyone link of the chain is not important, is not understand dependence of each individual link has on the other.
Last point, as near as I can tell, brown is not an official classification of ethnicity. Definitely not used by US Office of Management and Budget, and the US Census Bureau.