That’s a lot of stuff, to say nothing of the fact that non-policy attributes of the United States, like it being really large, have a lot of good policy-relevant features. It’s relatively easy in this country to just go someplace else and “start over,” we’re not dominated by a single hegemonic city, people aren’t especially under pressure to conform, etc.Well, I have no idea what the first sentence of the above means, but as for the conclusion, let me say this about that. Virtually every significant foreign writer who has discussed America has noted that ours is an exceedingly conformist society, indeed, they have gone so far as to consider our political, philosophical, and intellectual conformism the most salient feature of American culture. We are less tolerant of idiosyncrasy, eccentricity, and dissent than any other "Western" society. There is a deep undercurrent of distrust, bordering on hatred, for heterodox opinions and ideas, and no, I am not talking about whether or not one believes in "single-payer health care" or thinks we should have "free markets."
Also to the point, we have a cultural bias toward conversational accomodationism, so whereas if you dine with a group of French or English, you will encounter a diversity of opinion on all manner of subjects forthrightly and forcefully expressed, among similar groups of Americans you will inevitably see an intentional moderating of opinion to give the appearance of greater agreement.