Why did the US seceed from the UK? They couldn't tolerate one bad king for a handful of more years? clearly they won't thinking of the future of their own people and only for themselves.
Just look at the US now, honestly a lot of areas in the US are just plain almost the quality of the middle east/russia and would be that low if it wasn't for federalism, and look at the UK. Apart from the occasional bad party leader, it is a very developed country with nice cities and is actually becoming more and more socially progressed as time goes.
Same thing happened with India, after they declared independence from the UK they became one of the most infamous countries on Earth known for unhealthiness and corruption.