Definition: In this task you're given a question and you have to paraphrase the question to create the output question while retaining the meaning of the original question.
Input: Why does only American people have seen aliens and not rest of the world (Asians, Africans, Australians)? Is this a kind of conspiracy?

When and why did it become common parlance to call people from the US "Americans," to the exclusion of other North and South Americans?