Comment by Udik

Sorry, I know "power alliances" wasn't too clear, but it was just a way to stress that these are in effect temporary, shifting alliances between powerful organisations (such as nation states are).

> For my part, I think the relationship is based on a general understanding that their people are alike in custom, beliefs, traditions, geopolitical place, etc

Yes, and this is what I was sceptical about. Just to give a few examples, the UK society is extremely secularised, with more than 50% of the population declaring itself non religious; nobody thinks it's a right to carry firearms; police itself is mostly unarmed; politically, there's a strong labour party that is way to the left than the US political mainstream, a welfare state and universal social security and health care. The demographic composition is much more homogeneous than that of the US, with a large indigenous population and relatively recent immigration. There is a lot of value put on tradition, social classes and social order. There is a hereditary aristocracy that holds reserved seats in a branch of the parliament. Etc.

> After all, America is the troubled child of the UK

Yes, and they share a language. But the US is an entirely different place: a whole continent with deserts, mountain ranges, tropical beaches and freezing wilderness. A huge amount of space that for centuries has attracted immigrants from all over Europe and the world; the US culture is a mix of many conflicting cultures released in a colonial setting where conquering and settling was for centuries the way forward.

Imo, the relationship of the US with the UK is mostly sentimental, while that of the UK with the US is one of subalternity.