What metaphors are used in Signs of Life in the U.S.A. by Sonia Maasik?

"The Terrorist attacks of 2001, which were an assault on all Americans, made no such tribal distinctions, however. In the post-9/11 world, which has caused many Americans to experience their common national and cultural destiny, a new kind of multiculturalism may be emerging. Rather than exploring cultural differences alone, we may also come to explore the multicultural identity that is modern America. Leaving behind the melting pot metaphor that assumed the assimilation of many-into-one, we may discover a new metaphor for a culture that the many have constructed. Then, it would be time to rephrase our question, not longer asking 'Who are you' but 'Who are we?" (Chapter 7, pg. 555)