The First Amendment, but mostly culture.

EU/UK/AU/NZ may grumble, but we'll mostly grumble quietly. Like Chinese.

USians be more like Iranians, who know their govt lies and censors, know accessing enemy media draws prison sentences, and then do it anyway. Highest percentage of Tor users on Earth, Iranians. Stubborn and savvy.

US is in the top 10 per capita Tor users even though they have comparatively little official state censorship. (Yet...)