@sarkwalvein I wouldn't call it mispronunciation, just a natural evolution of English and language in general.
@FAST6191 Wow, look at that first comment in the article you linked. The one criticizing Americans for changing it.
There is this article
here that says British Accent changed dramatically over the past 2 centuries while the American accent only subtly changed. Which means that if you want to see how the British originally spoke you have to look at Modern Comtemporary American English and not Modern British English, since modern American English Accent is closer to how both spoke.
But there is more to it that the article it isn't mentioning. Both American and British English changed and are different then how they spoke in the 1700's. There are words British dropped and changed and there are words Americans dropped and changed. There were also new words for Americans since they were in a different region and had to describe things that didn't exist in Britain. Neither regions dialect was conservative and evolved in ways that were the same and also different.
@ThoD Linguist's don't like the concept of the correct way to speak because there is no such thing. Langauge constantly changes and evolves. The way American and Brits spoke in the 1700's is different then how their ancestors spoke in the 13th century. And go back further in the past its different and so on. It's not because a idiot couldn't spell, its much more than that.
Another comparison of words changing for my point.... Why did Brits started speaking in Received Pronunciation and started to drop the R in words? Like for the word "hard", why do British pronounce it a "hahd"? Was it because British are idiots and couldn't pronounce right? Rhetorical questions. Americans pronounce the R word like how the British originally spoke in the 1700's. Both Brits and Americans were rhotic speakers, but the British changed it and became non-rhotic speakers dropping the R. And the Americans kept it the same rhotic way how originally Brits spoke. And it goes back to the top comment I made to FAST6191. Linguist don't see it as idiots changing language. There is no right and wrong in dialects, that'll be elitism.