They also had the gumption to dump all that archaic monarchy cult that a lot of you folks worship.
A typical assumption and yet again you are wrong. I have zero interest in the monarchy.
US English is not a 'modernisation' of English it is a different sub-dialect. It's that simple. The reason it's unfortunately creeping across the world is because it's the default setting in the vast majority of word processors and the like. UK & Aussie English is slowly being polluted because people are lazy and sheep-like.