Skin color is not a choice, our skin color is determined by our genes. In the dim distant past it is believed that all people may have had a 'colored' skin, then a mutation caused some people to lose much of their skin pigmentation and to have a blue or green iris. This causes a problem for these people as they become more prone to develop melanomas (like me for example) than people with more pigment in their skin. Otherwise, there is little difference between so called ethnic groups.
However, culture* is also a factor in how we view each other. For example, when Europeans began to travel in some numbers they perceived the Chinese and other East Asians as being white-skinned. that was when Europeans where surprised to find such a sophisticated civilisation in East Asia. But as Europeans entered into the era of aggressive empire building and came to the conclusion that they were "special' because they were subjecting people, who had more of the pigment called melanin in their skin (thus a darker skin) to their domination.
This induced in some European races a feeling of superiority. Think of Kipling's poem, The White Man's Burden. which (if you do not know) was Kipling's plea for the USA to continue its war on Filipino's who wanted to set up a independent republic. The USA did, of course, using similar 'burn and destroytactics that the US army had used against American Indians. Note the implicit racism in the words:
"Your new-caught, sullen peoples, Half devil and half child, Take up the White Man’s burden, etc
That world of the superiority of those with a skin with lesser pigmentation started to come to an end shortly after the USA's war of domination with the Philippines. Japan fought a short war with Imperial Russia and sank two of the Russian fleets, shocking many in Europe with its Eurocentric mindset
"Culture has various meanings in English. I usually use the word as referring to those things that can vary because of our background or choice. From a biological perspective we all must eat, and we eat somewhat similar things but from a cultural perspective those food products may be prepared and cooked in different ways,