"Get in line"... like Trump rules the fucking world.
Problem is, he's pushing countries away. He'd expect other countries' leaders to be dicks like him and when he attacks, they attack back. Problem is many won't, they'll sit back and take it calmly and work towards ending the US's reign of power.
The US gets its power from A) money and B) military might. That military might is being reduced. You think Germany would let the US use Germany's bases to attack Iraq or Afghanistan after what's happening now? No. So when the US wants to take out some OPEC leader who's going against the US's wishes, soon the US won't actually be able to fight back.
Trump only understands a world of business where he has many people he can deal with. If he angers one, he can work with others, and most of the time he's trying to screw them over.
China and Russia already have BRICS which is trying to stop the US being the world currency. That makes up nearly half the world. India and China together are 1/3rd of the world and both are growing.
If the EU moves away from the US, then maybe Japan and South Korea will go to. And then who has the US got? Nobody. It's all alone, people putting tariffs on the US, the US getting poorer.
The UK had Brexit, felt they were a power who could do anything they wanted and it wouldn't impact them. It did. The UK is much poorer now than it was ten years ago.