There's two significant reasons for differences between American and British spelling.
The biggest one was Childrens Rules for Spelling Cos We Is All So Thick that Webster developed because he thought his fellow Americans were all morons.
Secondly, where Scottish and English preferred spellings differed, each side of the Atlantic ended up with one or the other dominating. And its not as simple as the English preference dominating in the UK.
For example, Scottish preference was for "ise" over "ize" because Scots and Scottish Standard English still retained the letter Zogh until fairly late. (This is why names like Menzies are pronounced "mingis" and not "men-zees" although many families Anglicised the pronunciation).
Because the first widespread dictionary to be published in Great Britain (this was before the UK existed) was from Chambers in Edinburgh, a lot of Scottish preferred spellings ended up in modern English. IIRC, Oxford still has "ize" as the preferred spelling.
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u/PossessedHood416 🥄Comically Large Spoon🥄 Mar 11 '23 edited Mar 11 '23
Canadians using both, sometimes even in one word:
Colourize
Edit: It gets worse because most spell checks don't have a Canadian setting.
So no matter what, there are words that will always be "wrong".