Plenty of material on American anti-intellectualism, wikipedia cites some of it.
Quite. And lots of other places too, which tends to prove my point. And, honestly, those are only the ones that made the list. Factor in religious fanaticism and and fascism and the percent of the population covered increases. At least, in the US, you can bitch about it.
Communism. Not really big on intellectuals, but it's hard to accuse them on not doing much.
Free thinkers are a societal threat. They are tolerated in small groups and for short times. In the free world, such thought is generally curtailed through total control of the media. And, yes, that's the US as well. If you believe other places have it better, you simply haven't looked closely enough. Those in power like to keep it; some are just gentler than others.
It's a very, very fine line. Trust me on this.