The US does not only rule the world economically, technologically and militarily. It is also advanced in human rights. Right now, in many Middle Eastern countries, some Eastern European countries and some Asian countries, if you criticize their presidents, you are immediately thrown in jail. There is freedom of thought in the US and you can do this with respect.
Dependency on the US will continue.
I am not so sure about this. Yes, it is better than in some of the areas you mentioned, but Europe has a far higher level of freedom of thought in my opinion, without people being extreme in their thoughts. Though, the extremes are changing, aligning more with the polarised opinions.