Why do Europeans and and European-Americans have such distinct features not one of them looks remotely similar

Question

to any other person. Why is that?

Answer 1

I imagine it's because in the beginning, they all migrated to places of less sunlight, similar agriculture/food sources, etc. People are formed and shaped by the places they live. They adapt to their surroundings. Then when these people bred with others around them, they reinforced these differences. Now that disperse cultures are living in much closer proximity to each other, I imagine that over time, we'll see these differences become less marked.

Answer 2

I'm not sure if I understand your question correctly, but...
I think you mean each individual person, as opposed to nationality or race, right?
I think we look so different because we're used to each other. I bet if I lived in China for a few years, I could pick any certain person out of a crowd or at a distance as easily as I could a European in a crowd of Europeans.
Please tell me if I misunderstood the question.