Cecil Rhodes had a meeting where he formalized what was already de facto the case, which was several rings from outermost to key players large to small that effectively ran the British Empire. Britain basically always worked this way in modernity btw, read De Maistre, anyways they created a group to run and propagate the British Empire and part of their mission was to make it a world encompassing Empire, Quigley called it the Milner Group (thats who took over after Cecil). But anyways, this cadre along with international finance ran the global mercantile and financial Empire that was Britain and the goal was for that to run the world forever, but Britain destroyed itself in the World Wars so they had to settle for America (plus America was industrializing so fast and at such a scale it was almost inevitable they would become hegemon eventually). So now America is the seat of the Empire but the City of London (note i said City of London, not London) runs a lot of the financial element of the Empire still. If you've heard of "offshore banking" thats also their purview.
It should also be noted that what Cecil wanted and what it is now are not 1:1. Modern estimates of net worth also should be discarded, it doesn't matter what was on the ledgers, if you can have the British Empire declare war and you personally own 95% of the world's diamonds and 3 countries how do you quantify that. Anyways, read Quigley.
I should actually explain it one day but the global financial order is run out of NY and the City of London and the physical manifestation of it was in turn the British Empire and then us after Britain destroyed itself in the 2 World Wars. There isnt another Empire for this machine to cleanly plug into so for good or bad theyre gonna ride out the US until theres nothing left.