Americans took Imperial and changed the measurements but kept the names,
Not accurate. Imperial and US customary were designed side by side. They share a common history en.m.wikipedia.org/wiki/English_units but US did not come from imperial
That’s totally not fair. Some things are more wrong than others. And the “everything is correct even” language people are just as insufferable as the “there is exactly one correct usage” people.
Using it’s instead of its is not slang, or an evolving use or alternative spelling. It’s simply wrong.
I think we've been had (startrek.website)
It can't be stopped (startrek.website)