Hussar
Legend
Well, there's other issues as well. The fact that your country is smaller than some US states does make centralization somewhat easier. Never minding less than a tenth of the population.Way I understand it is more who went where. More Scots came to NZ proportionally. Scotland had very progressive and educated enlightenment.
By 19th century standards.
In America they kind of recreated the aristocracy. Big plantations and landed gentry in all but name. Here they broke up the big landowners in the 19th century.
More egalitarian, social laboratory for the UK.
Most of the other differences are basic things like how schools and cities are funded. More centralised and due to how things are funded we don't really have rust belt type areas and the regions are reasonably prosperous.
People tend to forget just how freaking big the US is. Not just in area, but, population.