That is indeed a lot of reading for me to do. I read though a lot of it, though. I'd be wrong to write a lot myself but not read large posts of other people.
From what I can tell, you don't like how dominant American pop culture is throughout the world. There's a little word for that called "cultural imperialism". That is sometimes used right and sometimes abused for a separatist, anti-multicultural agenda. Or for people to justify bad aspects of multiple cultures. Other times, it shows how unfair things are.
The flow of culture is largely one way. That is, from Western colonies of Western Europe who speak English to the rest of the world. In which most of the media around the world is about white people who speak English, or racial stereotypes of non-whites. It's a real problem. In my opinion at the very least. Lots of cultures and languages are starting to disappear from this mostly one way flow of culture.
Though, other than better racial and ethnic representation, there isn't much we can do as a privileged group in a globalist society. Perhaps challenging big Corporations that help to decided to segregate markets and speed up the global cultural washing process. And perhaps lessen the money inequality in the world.
One of the reasons the United States is so dominant in the media is because of money. It is also helped by the fact that the United States is the origin of Hollywood. But money is certainly a massive influence. In fact one of the reasons that Japanese and South Korean entertainment is powerful and influential worldwide while languages around the world are currently dying, is because these countries have money. More money, means better representation. The United States, Western Europe, Japan, and South Korea all have money, and lots of it.
Other races and nations will be better represented, when, in the global sphere, they are less poor. Countries being poor is already a negative thing period. No nation should be poor. And having your culture wiped with American culture is an unfortunate side effect. This is just one small reason among many more important reasons to end global poverty.