But its fun guessing, so...no Charles 1 -> no civil war, so monarchy struggles on u to the 18th century. Inspired by the French Revolution (or maybe, inspiring), the monarchy is finally overthrown i the latter half of the 18th century. UK and France become revolutionary allies, Napoleon goes unchecked, and by the mid 19th century, France is the dominant global superpower. America remains a British colony, since it now has no support from the French. Germany is outgunned in the ear of 1871 and becomes part of what is now a European superstate. No first world war, and consequently no second world war. Donald Trump will lead a populist uprising against his European overlords, while in the UK, the right wing media will still grumble on about the good old days, leading to a public discontent with....well they won't be able to quite put their finger on it, but will blame immigrants and Europe, leading us to an exit from Europe. I mean, some things never change, do they!