I fully expect the ramifications of this to be missed in the US, the scale of large countries (in terms of size and population, i.e. US, China, Russia, India, Brazil) makes them become desensitized to other countries, they effectively live in their own worlds.

Their balance sheets will trickle slowly down as dependent countries phase slowly, independently and sensibly. Given they can't see the effects near them (USA's own market is so huge it gives the impression an isolationist arrangement will suffice), I do really believe the rope will thin unnoticed for quite some time until it snaps, and USA Big Tech and the US government will scratch their heads in confusion on what changed and how they got there.

One of the unanticipated - and probably unintended - outcomes of the kind of hyper nationalism exemplified by Trump's America is that it invariably excludes everyone else. The 'free Internet' turns out to be the 'American Internet', which can be turned against you at any time, for any reason. Cultivating alternatives will be challenging though - can't see anyone doing it to be honest, Europe had a chance in 2000's but complacently thought they would always be in the garden, and are now shocked to find themselves in the jungle. You have to say, China got it right with the Great Firewall, though they too were assisted by early US hostility which underlined the need to de-risk