Technically you are correct about America. But I wish the President of America stands in UN General Assembly and explains at length why America has to wage wars around the world, why it has to destabilize other countries.
They won't, they don't see it as invasions, but necessary interventions for so-called Protecting American Interests or security, that's the same manjan they are selling since Afghanistan, and it will keep selling it as long as they hold the Power, or I should say Blackmailing Power and influence over the world, with of course their Powerful unmatched Military/economic might. Every empire and Powerful country becomes greedy once they know they can do things to smaller and weaker nations and get away with it, USA is no exception. Even Islamic empires have done it in the Past, except for Rashidun Caliphate. Obtaining power from various means is easy, but keeping your morals, ethics after getting that Power is hard, as Spiderman said With Power comes great responsibility and everyone fails at keeping that responsibility.
You yourself said that an American calling 911 has to shell out 1500 dollars to get treated. What if a homeless person is ill and cannot afford the treatment. Yes, Superpower America having homeless people who cannot afford treatment, yet the same Superpower America invading a welfare system country like Libya where there are no homeless and the healthcare system is free. Irony !
calling for an Ambulance might cost you based on the distance from where they pick you to the hospital, of course, you don't have to pay right away but it will be added to your bill once and if you are discharged from the hospital, why you think Americans buy generic pills from Walmart and do other things for flu, fever and other remedies rather than going to the hospital because they know it will break their budget and God forbids if someone gets a serious disease with a horrible Insurance than they are doom.
For the US invading other countries, let me tell you this US do things which they do because they know they can do it without facing the consequences, they know all they have to do is say Sorry, for no matter how many Civilians they blast in Drone strikes, no one can touch them, they control UN, IMF, and world bank and have military bases in every major economic chokepoint, who wants to go against the US? No one, and no one will because they know it's a battle they won't win.