I find it interesting that people in the United States claim to be so great but they exclude any other country in the American continent(s).
US people have never claimed to be great. What they claim (& is true) is that the US is the greatest country -- primarily because of its Constitution recognizing the natural rights of all humans and the US' successful implementation of those policies so far (actually, up until recently).
Perhaps your understanding of English is at fault. You should have not made such a mistake as this.