You’re making a comparison then quoting only one side of that comparison, which is deeply confusing.
I’m pretty damn sure you’re wrong about Europe on a relative basis. The percentages in most of Europe are MUCH higher. Eg Germany is closer to 80% than 50% gov funded.
(Earmarked gifts to an endowment with some level of direction/advice vs a foundation is a real cultural and tax policy difference, but the end effect is what matters and that’s not as simple as you’re suggesting.)
And not to be too flippant, but the question about the world outside of America applies also to the world outside the West ;)