Then why did the USA sabotaged every attempt at a European army?

The answer is because you twist American President words: they want Europe to "invest" more in its defense, but stay subversient to the US, not take more "responsibility" as you wrote. Which means, in plain terms: "buy more American weapons". There has never been any honest wish for Europe to shoulder its defense, it is a pure money grabbing scheme.

You just have to see the hissy fit they throw every time Europeans put "buy European" conditions to any rearmament program.

Europe would be fully military autonomous if Europeans listened to the French. The countries that blocked and sabotaged French initiatives and European procurement all have a "special relationship" with the US: the UK first and foremost.

>It can't be resources - Europe is rich.

Oh, suddenly we are not "Europoors" anymore. Funny, that.

> During that same time, Europe has insisted that it knows better than the US cowboys.

Uh, weren't we right? I mean, isn't "no more foreign wars" a big rallying cry of a certain president and especially vice-president that resonated with a lot of the American electorate? On what grounds are you snarky here, exactly?

(We also saw from the beginning Trump was a liar, a conman and an idiot, but I guess you will reproach us with that too)