How about you count the sales in the 10 other countries it went number one in, one of which was Mexico in which it went gold after just one day?
It's funny how people have been using these numbers forever, but suddenly when they don't benefit their fave, they're nonsense. Sorry Ariana is global unlike some of your faves (cough cough Selena) and can actually sell outside the US. To think, Ariana's done barely any promo and hasn't had a major worldwide hit this era, yet she's still almost doing My Everything numbers even despite the sales decline. Queen!
Sorry but Ariana's numbers here are clearly inflated.