I like to say that we IMPROVED it...
You know I'm kidding, right? Honestly, we took the English language and basterdized it... adding a few (hundred) words from this language, a few (thousand) words from that language and there you have it... American English.
I remember once when I was working an informational kiosk in Orlando, FL giving away Disney and other tourist info, a person came up that only spoke Spanish and my Spanish was rusty at best. I pretty much gave him the info he was looking for and he went on his way. About 20 minutes later a Brit came by and I was telling him about the previous person, telling him, "it was funny... all he could understand was Spanish and I was speaking in a mix on Spanish and English..." and that was all I got out. He very LOUDLY interupted me saying, "You Sir do NOT speak English! I speak English, YOU speak American!". He was right, but I absolutely felt he was way over the top and a bit rude. I gave him his pamplets and he was on his way... lol
When I visited England (twice as a Sailor), I made sure to tell my friends to be careful if they refer to what language they speak...