No conspiracy required.
The vast majority of articles on white inventors do not mention race, for example the Wikipedia article on Albert Einstein does not mention race at all, so the search algorithm can't find what isn't there. If you search American inventors, you get a worse result because many articles about American black inventors mention African American in the articles title. United States inventors gives you a better (and more diverse) result.
You get a skewed result from the fact that articles about white inventors rarely, if ever, mention race, while black (or other races) inventors frequently mention race in the article title. As much as I hate Google, that is hardly their fault.
So your searching for something that is not there to find so you use it to fuel yet another B.S. conspiracy theory based on the fact that Google, Bing, Duckduckgo and others basically suck and frequently give bizarre results to a search.
Baidu basically gives you nothing at all, but did include a picture of Minions when I searched on it. Bizarre results indeed.