I looked this up! It's still called the "King's English", actually. Patriarchy yay!
And American English is a dialect of English - you guys just get more credit than other people that can't spell doughnut because you are so numerous. FOR NOW.
This always strikes me as odd, since that assumes there's a king in question to use as a basis for comparison. But since there isn't one currently alive, the last king to reference would be George VI. And if you speak any words coined in the time since his demise, you technically are not speaking the King's English
We also use both spellings. Just like we use both spellings of "bologna" in the nation. We also have taught Canadians to accept a number of our spellings, and as time goes on plan to eventually pervert them fully. We'll have them using miles and feet again soon enough!
And, hey, soon we'll have Brits doing the same. All of that work to get an American into the monarchy seems to have paid off...
We are the kudzu culture of the world!