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When Layla is struck by the "Americanness of the throngs of people" during orientation, it means that she is noticing distinct characteristics or behaviors that are commonly associated with Americans. Here are a few possible interpretations of what Layla might mean by this statement:
1. **Cultural Diversity**: Layla might be noticing a diverse mix of people from various ethnicities, backgrounds, and cultures coming together, which is a common aspect of American society known for its cultural melting pot.
2. **Fashion and Style**: Layla could be observing how people are dressed or their fashion choices, which might reflect popular American trends or styles that stand out to her.
3. **Friendliness and Openness**: Layla might perceive a sense of friendliness, openness, or approachability among the people she sees, as Americans are often known for their outgoing and welcoming demeanor.
4. **Language and Communication**: Layla could be hearing a mix of languages or accents spoken by the crowd, highlighting the linguistic diversity that is often present in the United States.
In summary, Layla's observation about the "Americanness of the throngs of people" likely refers to her recognition of distinct cultural, behavioral, or visual cues that are commonly associated with American society.