I think part of the reason why American propaganda is so powerful is because most people only speak English as a second language. That way they are extra vulnerable for misinformation since they only get the American perspective. And since they can't speak other foreign languages they don't get the other perspective.
Idk it took like 1000 years after the end of the Roman empire for Latin to stop being an important language in Europe. If the US vanished tomorrow (if only), im sure many countries would continue to use English for a long time because they're too busy building a brighter future to learn Esperanto or whatever.