Answer:
The essay needs three paragraphs, each paragraph could describe an aspect of American identidy.
The first paragraph can be related to how the government of the U.S. shapes American identity, especially because the government is a federal republic.
The second paragraph can be related to the cultural diversity of the U.S., and how many different cultural identities live in the country.
The third paragraph can be about how immigration has shaped the country from the start.
