I agree but not in the way you think.  Yes, why indeed America, right?  After all, they shamelessly funded Pakistan and turned what could have been a democratic bulwark into a permanent military state, poisoning India's own republic in turn.  Yes, so I indeed propose that the world should get on without the USA (something the EU is anyway contemplating).  To that end, let us all start trading in Euros.  

You know, it's not the 1960s and we don't need the US Dollar as a reserve currency anymore.  Euros are as easily available as USD and there are already countries in Africa that prefer to trade with us (India) in Euros.  We could do ruble trade with Russia, yuans with China and Euros with the rest of the world.  We already do the first mentioned of these and we have Yen currency swaps with Japan as well.   If we can persuade the Arabs too to move to Euros, then the US currency privilege is toast.  

And if you think that is a good thing (for the US), you're in for a rude shock.  You have no idea what an exorbitant privilege the US has enjoyed thanks only to the petrodollar.  This privilege was at least acceptable when the US was prepared to do the heavy lifting, which ended with the 80s, the first decade in which US became a net debtor to other nations.  

It is so laughable from an outsider's perspective to hear people like you talking of other countries enriching themselves at the US' expense.  What dream world do you live in?  Would that be a world that is blissfully ignorant about the rest of the planet because living in the US means you don't have to care about what others are up to?  Your country has been setting the rules for the last half century.  If you think those rules aren't working for the American people, take your political class to task.  But to resort instead to decrying other nations who thought they had a contract, an understanding and a friendship with the US can only end badly for the US.  It will be bad for everyone but sure as hell the US will sink deeper than the Titanic if it keeps going back on its word and continues to be an undependable ally.   Once again, this is not the 19th century anymore.  You have gone far too deep into internationalism to turn the clock back now.  Realignments are possible and desirable.  That is exactly what Obama was doing and you never gave him credit for it just because he was black.  Isolationism OTOH will hurt the country that seeks isolation for itself.  American jingoism and British nostalgia for Empire together seem set to bring down both nations unless they can fix this bug.

You don't THINK, but that will be the effect of his many decisions. Just like Brexiteers don't THINK it will isolate their economy but it WILL, whether they like it or not.  Unilateral flip-flops that nobody, not even his own team, knows are coming and you expect the rest of the world to still trust the USA?  Based on what, exactly?  It was bad enough when Bush invaded Iraq with no evidence only for Rumsfeld to say sh*t happens but whatever repair Obama carried out has been undone.  

Oh yeah, big whop, Brussels telling USA what to do?  Cool story, take it elsewhere.  Funny how the people (conservatives) who wax eloquent 24/7 about responsibility are so loath to take responsibility for their own decisions, their own mistakes.  If Brussels really was controlling the world, we would be able to do business with Iran and would be very happy to.  The real enemies are the Wahhabis and they reside in Saudi, USA's biggest friend.  Do you know that we can't even do sea shipments to Afghanistan via Bandar-e-Abbas port in Iran because multinational (mostly American) banks are so scared of sanctions?  And you keep blaming Brussels?  Sorry, but the facts don't care about your feelings. Who reversed the whole process of bringing Iran back to the mainstream?  Your precious commander-in-chief who has been played royally by the GOP hawks.  Yeah, totally stable genius, isn't he?  No wonder he and Modi get along like a house on fire.  Oh, and your heartwarming story about doing good for black people in the neighbourhood has little to do with your feelings about Obama because it says nothing about how you would react to a black man in power.  So try harder next time.  

Which is why the prior status quo was better.  First Trump removes the troops and then he furiously threatens a NATO ally with dire consequences "if they don't listen to me".  This is a total mess, as with other things Trump. I am particularly worried being that this is Turkey.  It was the epicentre of the First World War.  Turkey is a very important country from a geopolitical perspective so shaking it up too hard is, again, not going to end well.  

I think one of the European commenters already brought this up in this thread. Europe will bear the brunt of any blowback from a Turkish crisis.  What the Trump supporter above did is to willfully misinterpret what I am saying as an argument for more intervention and more wars.  No, all I want is that if there is going to be a pullback, it must be orderly and with all allies on board and consulted prior to any such move.  That is not what Trump is doing.  Nobody knows why he does what he does and what he will do next.  That is bad for ANY head of state and for the virtual leader of the world (albeit less so now that both Russia and China are stronger), it is catastrophic. I do fear the worst now.  But let's see, maybe, in spite of all previous evidence to the contrary, better sense will prevail and either the army or the GOP will finally tell Trump that enough is enough.

--- U.S. Constitution, art. I, § 9, cl. 8. The President of the United States has just referred to the U.S. Constitution as "phony". Whether through narcissistic self-absorption or simple blithe ignorance, when you have an individual in power who scoffs at the very instrument and driving force of our Republic, he must be removed from office. 

The fact that Trump continues to push his Doral resort days after having to remove the site from consideration for the G7 meeting due to intense pressure on both sides of the aisle (he'd like to just blame the "crazed Democrats", but his stupid, self-serving decision was roundly criticized by Republican congressmen and senators), is indicative of a person completely out of touch. 

--- The President of the United States is a liar. Unequivocal. Without doubt or precedent. No troops are coming home. None. In fact, more troops are being assigned or reassigned to the Middle-East.

---  The President of the United States is a prevaricator. “I’m trying to get out of wars, we may have to get in wars," -- his dissembling words, not mine. War is peace. Peace is war. George Orwell's skull is spinning 'round his bony spine in the grave.

No, you don't get carte-blanche and a get out of jail card so you can do whatever the hell you want, without consequences. Asked about Trump's quid-pro-quo Ukraine call and back channel political chicanery from Rudy Giuliani, 'ten former chiefs of staff from five former Republican and Democrat presidents -- Ronald Reagan, GHW Bush, Bill Clinton, GW Bush and Barrak Obama stated in interviews that the very thought of soliciting political aid from foreign leaders was unacceptable and "out of bounds".'