[TapWaterBandit]

It is hard to disentangle the temperament of the populace from the voting system.

The UK and all former settler colonies (Canada, Australia, New Zealand) all have very stable politics and that generally appeal to the median voter. None of them really have any extreme political incidents in living memory that I can think of. (maybe a few extreme incidents by their own standards but on a global standard they are still tame)

[throwaway2037]

"former settler colonies". US and South Africa do not count? How about Latin America vis-a-vis Spain and Portugal?

[TapWaterBandit]

I thought it was implied but I meant former settler colonies of the UK specifically.

The USA could be included and does have overall remarkably stable politics compared to most of the world. I didn't include it due to the length of time it has been separate from the UK, however there was substantial emigration from the British Isles to the USA in the 19th century with the settling of the West (more British went to the USA in the 19th century than Canada/Australia/NZ/South Africa combined and served as a 2nd large wave of Anglofying influence on the nation). I would lump it in with the other nations I mention as having overall extreme stable politics and high adherence to political norms that can be broadly characterised as the "Anglo model of politics".

South Africa is a bit of a unique case. Due to the Apartheid system it never had any of the sort of political stability that characterises the politics of the other nations mentioned.

The political culture of Spain/Portugal is massively different from the UK (especially at the time of the colonisation of the Americas) and the model of politics in the nations of South America is very different as a result.