Is the word "American" not allowed within a Windows Live ID?

I was trying to create a new Windows Live ID today,but it kept rejecting the
ID that i wanted.So i added a few random characters at the end hoping that
would do it.But it wasn't until i removed the letter "N" off of "American"
that it was accepted.I also emailed the ID to see if it was taken only to
get an email failure.The name i choose started with the word American.I tried
different variations that i'm 100% sure that NO ONE else could possible
have.If you think i'm mistake,try for yourself.Create a new user profile
@live or@hotmail,then try and use the word American within the ID.After your
rejected,a help window will pop up trying to assist you with ideas,this help
window will not help you find any variation of the words "America" or
"American".Does this bother anyone else?Whats the Deal Microsoft???