>>10638241>How did human beings get so white?Simple evolution. Dark skin absorbs UV better, protecting against sunburn and cancer, but taking more energy to maintain as the melanin needs to constantly be replaced and reducing the amount of UV available for vitamin synthesis. In low light conditions (which forests in the temperate zone have), pale skin is an evolutionary advantage, while in bright conditions (around the equator, in the desert and in the polar regions) dark skin is more useful.
>Considering the first human being was africanThat's just a claim without proof, based on people wanting to have a continuum from the first human, through the first civilization to modern day europe. There are also archeological findings suggesting that the first humans may have lived in southern china, and there's no way to prove that humanity might not have developed somewhere else entirely.
Also, the first intelligent humans proven to exist were the neanderthals, which were european, white, and genetically closest to modern day germans and scandinavians.