How did debates over american democratic culture and the proximity of many different cultures living in close contact affect changing definitions of national identity?

The changing definitions of national identity were largely affected by the close contact of various cultures within the United States leading to a melting pot of ideas and arts.
The interaction between various cultures resulted in assimilation/combination of the arts/knowledge of more than one culture into one, which somehow transform our perspective on what we considered as a national identity.

The answer would definitely false