"Beatrice, you speak of (quote): "the variety of all the different languages from all around the world melted in the pot that is the English Language". You seem to be convinced that American English is a different language, too, given that you also refer to (quote): "their culture or language".
Given that, why should you object to their words and phrases also being added into our great melting-pot? It never ceases to amaze me the way some British people manage to convince themselves that American English is some kind of great evil that must be fought, when it is actually among the most vibrant of the many differing versions of English...West Indian, Indian, Australian, South African etc.
The other thing is the fact that some of their so-called chopping and changing is nothing of the sort...rather it is we Brits who changed things whilst the Americans stuck with the original version. For example, when Sir Humphry Davy discovered what we now call aluminim, he actually called it aluminum, with no second letter i. Only the editor of a Briftish scientific magazine altered it to the modern British spelling. Surely the discoverer of something has the right to name it! So, what do we find now? The Anericans still call it aluminum! Who got it wrong, them or us?
The plain fact is, ma'am, that Americanisms are here to stay, so you might as well either enjoy them or ignore them. If you don't, you're going to be beating your head against a brick wall for the rest of your days.