Final answer:
The passage explores unity in diversity in the United States, questioning its purpose and discussing the evolution of cultural identity within the nation.
Explanation:
The central idea in the passage from 'A Quilt of a Country' revolves around the concept of unity amid diversity in the United States. The author questions the purpose of a nation with various conflicting groups existing together yet not fully unified. Historical perspectives on American culture have influenced the understanding of diversity and identity within the nation, moving away from the 'melting pot' metaphor to a more nuanced view of multiculturalism and regional cultures.
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