Hmmm, no, this is flat-out wrong.
You've clearly never been in UK, Germany, or France, and yet, you think you have precise insight of the politics of those countries and the world.
The most terrible thing is the inesorable logic of how people develop this sort of thoughts, through growing up in cultural closeness, put together with exposure to militaristic propaganda (note that it's a general remark, not referred specifically to US).
You would have to be living under a rock to ignore the long history of European internal wars, and equally to ignore the fact that European countries have been able to maintain a minimalist approach to defense spending because of the US security umbrella.
So, no, history doesn't suggest that. Neither does recent history with 20+ regime changes.
edit: I feel like it needs reminding - I realize that in terms of geopolitics there needs to be a superpower. Every century has had a superpower that in all likelihood abused the weaker countries. My issue is with the way OP describes the issue: US being benevolent and great, bringing in fruits to US economy, completely ignoring repercussions worldwide.
Eh fine. I'm starting to sound self-righteous. My issue with your statement is how absolutely peaceful you are about contributing to war machine. You're implicitly helping the armed forces kill people.
If I remember well, Afghanistan, Irak and Iran are the last places where US overthrew a Shah or a dictator. I don't remember them being a working democracy recently.
By the way, why was there a dictatorship in the first place? Most often because of a colonial past (we're all guilty here, I am French myself). I just want to remind that I see nothing good in a country just overthrowing a dictatorship: What we need is to build economic growth, like the Plan Marshall.