One of my less treasured memories is of a State of the Union address, or possibly a presidential inauguration, at which a Nobel Laureate got up and read, in a terribly solemn voice, some politically correct screed about what a wonderfully inclusive nation we all were - "The African-Americans, the Ethiopians, the Etruscans", or something like that.

Could that be this one? It was indeed read at Bill Clinton's 1993 inauguration, by Maya Angelou (video), who is neither a Nobel Laureate nor (as I originally thought you might have meant) a US Poet Laureate, but, although I can't really figure out what this poem is about, it does sound a lot like the one you mentioned. ("...the Asian, the Hispanic, the Jew, / The African and Native American, the Sioux, / The Catholic, the Muslim, the French, the Greek, / The Irish, the Rabbi, the Priest, the Sheikh..." Then I think they all walk into a bar.)

(No Etruscans there, but I don't think there are a lot of them about anymore.)