I'm seeing that I get a red squiggle under the words asian and european. When I right-click either, it wants to capitalize the word. I wouldn't think a general type of thing gets capitalized, such as "evergreen tree", a type of tree, versus "Blue Spruce", a specific type. I would think I need to capitalize "Chinese" or "German" or "American", but not the broader types of "Asian" or "European".
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All proper nouns need to be capitalized. I believe you are puzzled over whether "Asian" is a proper noun or not. I don't see why not. We need to define what a proper noun is:
Now, I believe you think that "Asian" is too broad a noun to be called a proper noun, because it seems to represent a class of entities, that is, a group of various people, such as Spanish, French, etc.
Does that mean, however, that we shouldn't capitalize "Europe", but should just write it as "europe"? Of course not. "Europe" still refers to a specific place, a continent, and "Europeans" refer to a specific people, the people that come from Europe. And there's only one group of people that comes from Europe, the Europeans.
Europe and Asia are the proper names of continents. It doesn't matter how general the term is, they are all humans but that isn't the name of the species so isn't capitalised. Homo-Sapiens is the species proper name so is capitalised.