There is a lesson for people governing global empires here - don't allow major wars to blow up on your borders. Or, ideally, anywhere. Maybe spend some time promoting peace and prosperity. Train the diplomats in diplomacy.
You'll notice that the US solution at the end of WWII was completely different to the European settlement at the end of WWI. And the US approach to warring was a lot more staid than the UK's. These are basic matters of competence.
Also, there was a complex web of international treaties and alliances that eventually pulled the UK into the war.
They were first cousins, along with the German Kaiser they went to war with.
Another key factor is that the US had no empire to hold together, and, to its credit, wisely did not seek to expand its territory after WW2 in order to create one (which it could have easily done, and which the UK had done many times before).
Heat waves up to 35-38c aren't unheard of. Our houses aren't built for this so a heatwave is quite uncomfortable as houses stay 20-25c overnight
Plenty of flooding in various parts
This autumn and winter has seen a lot of storms
The south fares much better of course and without as much flooding
By the end of WW2 the UK was bankrupt and completely ruined economically, while the US had become the industrial powerhouse of the world thanks to abundant resources, manpower, and the fact that the war largely took place far from its borders (a few tiny islands notwithstanding). By the end of WW2 the US owned nearly all the gold that Europe previously owned which led to the US Dollar the worldwide reserve currency.