Where are all the Americans?

This was nominated for best joke of the year -

A Somalian arrives in Minneapolis as a new immigrant to the United
States.

He stops the first person he sees walking down the street and says,
"Thank you Mr. American for letting me in this country , giving me housing,
food stamps, free medical care, and free education!" The passerby says, "You
are mistaken, I am Mexican."

The man goes on and encounters another passerby. " Thank you for
having such a beautiful country here in America !" The
person says, "I not American, I Vietnamese."

The new arrival walks further, and the next person he sees he stops,
shakes his hand and says, "Thank you for the wonderful America!" That
person puts up his hand and says, "I am from Middle East , I am not
American!"

He finally sees a nice lady and asks, "Are you an American?" She says ,
"No, I am from Africa!"

Puzzled, he asks her, "Where are all the Americans?"

The African lady checks her watch and says..."Probably at work!!!!!!

IF YOU DON'T PASS THIS ON TO ALL YOUR FRIENDS, TOMORROW AT 11:30 AM YOU
WILL RECEIVE THREE ILLEGAL IMMIGRANTS ABSOLUTELY FREE.