It is AMERICAN ENGLISH When learning English as a foreigner you decide either you want to learn American or British English. They are very similar that you can understand both, you can communicate and that is the most important part of language.
That American English has different expressions, uses of words and meanings does not mean it's a 100% different language.
Let us compare English with Spanish. All over the world there are different pronunciation,words,meanings,etc.In Spanish but those who speak any kind of Spanish can understand what others are saying.
The language can be modified depending on society, technology, time, etc. We choose how we want to use our language.
There are proves! We have all watched videos and photos about it. People close to us have seen these "aliens" even Bible mentions about them as demons.
We do not know what they are really like or why they come to visit us but we cant deny the truth.-.. Think about it....Aliens are real