Wasn't Webster a Yankee?And are Canadians refered to as Yankees, or were you using the word American to mean only those of us who live in the U.S. of A.?
As for names for Americans - Israelis probably call us "Cash Cows" in honor of the $3 billion plus we give then each year.
Just about everone else has a negative term, I'm sure.
pax yall