Google, Bing ... its their company, they can show what they want. But let me give a little lesson on search engines and how they work:
First, if you are in US, using Google.com, and type in "United States Inventors" you get results similar to the Spanish and Portuguese "American Inventors."
Google presents results by relevancy, tries to determine intent, and factors in localization.. User interaction with the results is also important. If a result gets no interest, they're not likely to show it as much.
So right off the bat, POSSIBLE explanations for what you're seeing
1) CTR history on African American results for that query
2) Cultural differences in search intent / frequency. by language and location
3) "American", with no qualifier, is an ambiguous term. North American? South American? Central American? Afro American?
But here's the REAL reason:
The carousel for that query is essentially an "instant answer" or "featured snippet" being derived from
Wikipedia's Inventors by Nationality category page, taxonomy NOT from Google search itself. If you go to that category page on English language Wikipedia, you'll see there are
two sub-categories for American: African American Inventors and Puerto Rican Inventors. Google mashed up those sub cats as the most relevant results (since they have subcategory status) and probably grabbed Edison as a high-frequency result from one of the category pages.
Note there is no United States inventors page on Inventors by Nationality on English Wikipedia. They're sourcing the carousel for that query from elsewhere.
Two leaders with nukes and itchy trigger fingers. What could go wrong? 45's been talking about using nukes for decades - he's obviously fascinated with the prospect.
Even if US *could* totally destroy NK in the event of a nuclear conflict, at what cost for us all?
