2008 test · Question 88 of 100
Name one of the two longest rivers in the United States.
Official USCIS answers
- Missouri (River)
- Mississippi (River)
Why this is the answer
The Missouri and Mississippi are the two longest rivers in the United States. The Missouri is the longest, and the Mississippi is the second longest. Both are major rivers that flow through the central part of the country.
💡 Memory tip: Remember 'Miss' + 'ouri' and 'Miss' + 'issippi' — both start with 'Miss' and are the longest.
This is the 2008 test, for N-400s filed before October 20, 2025. Filed on or after that date? Use the 2025 test.
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Source: USCIS, Civics (History and Government) Questions for the Naturalization Test (rev. 01/19).