I think they have little contribution to mankind.

When various civilizations developed vigorously on the Eurasian continent and discovered farming or animal husbandry, smelting and pottery making, various medicinal materials, the laws of the movement of stars, and the laws of solar terms, south of the Sahara The black African tribes still hunt with pointed sticks and remain in the primitive state of drilling wood to make fire.

For thousands of years, in the essence of the development of human civilization: philosophy, literature, science, music, etc., you can’t even find a black name in any development history.

U.S. President Richard Nixon once said in a private speech, "There is no hope for black people. If we look at the past 10,000 years of human history, among all the races in the world, black people are the only race that has never been There is no way to build a society that is influential around us."