I was gonna say this, but not specific to USA and UK. Other countries have thriving music cultures born of immigration we just don't hear about. Nigeria, for example, had a progressive rock scene in the 70's and it was kinda baller. Check out the Lijadu Sisters.
I've been listening to Creole music all morning as "research" for my next writing project.
Made me think about the volume of information we take in about other cultures through stories, art, music and food without ever opening a history book.
Edited for context and to clarify I don't think slavery was a necessary evil. Because I have to do that now.
Soviet style mass apartment complexes to combat homelessness but you have to download an app to get in and out, and the app collects and sells all your data. There's a concierge who does spot checks but they accept bribes in fresh fruit, vegetables and old N64 games.
The internets. Multiple internets, like different streaming services and you need to pay a subscription to each one to access all the websites.
Rail guns. Everyone will have a rail gun. It will be awesome.