German
U.S. citizens would probably not be speaking English as their primary language, if it weren't for the Marines! And, most likely would not be U.S. citizens.
Probably not.
first you would probably want to practice speaking with another person on what you are going to say. Then you want to practice your body language because most jobs will study your body language
You could try to remember a few words that they said and then do an Internet search for them later. Hopefully, some articles or translations will pop up that will alert you to what the language is. I'm sure, though, that your friends would probably be happy to answer your questions if you asked, and they would probably be happy to have the chance to tell you about their language.
No
it would be easier to communicate with others
Hitler probably would have won WWII
If someone wished you "Joyeux Noël," they would be speaking French. "Joyeux Noël" translates to "Merry Christmas" in English.
When speaking of the entireity of the language, usually you would say "el idioma", or or less commonly "la lengua". When speaking of specific wording, as in "the specific language in this paragraph", use el lenguaje.
We might not be speaking English if Caesar had not concurred Gual. We might be speaking German or another European language.
The Supreme commander was of course Hitler, but it would probably be more accurate to call Himmler the leader of the Holocaust.
by some people yes. if you were to confront Hitler saying you hated him you would probably be in a concentration camp.