10 Hardest US Citizenship Test Questions and Answers

Some citizenship test questions are much harder than others. In a 2019 survey of 41,000 Americans across all 50 states, the Woodrow Wilson Foundation (now Citizens & Scholars) found that only 40% could pass a test based on the same civics questions asked of immigrants, and among adults under 45 just 27% passed. If lifelong Americans struggle with these questions, it makes sense that applicants studying for the first time find certain topics especially challenging.

Below are the 10 questions that trip up the most test-takers, each with the correct answer and a memory tip. All questions come from the official USCIS civics test study materials at uscis.gov.

Why Some Questions Are Harder Than Others

The hardest citizenship test questions fall into three categories: questions that require memorizing long lists, questions with specific numbers, and questions where the "obvious" answer is wrong. Many applicants confuse similar-sounding facts, like mixing up the number of senators (100) with the number of representatives (435), or struggle with questions that require naming multiple items from memory.

The 2025 civics test (for N-400s filed on or after October 20, 2025) also added roughly 25% new material to the question pool, so some questions will be unfamiliar even if you studied from an older list.

The 10 Hardest Citizenship Test Questions

1. There were 13 original states. Name five.

This is the current wording on the 2025 test, which asks you to name five of the 13 original states; if you filed your N-400 before October 20, 2025 and take the 2008 test, you only need to name three. It is one of the most-missed topics: in the foundation's 2018 national survey, 72% of Americans either misidentified or were unsure which states were among the original 13.

Memory tip: Group them by region. New England (4): Connecticut, Massachusetts, New Hampshire, Rhode Island. Mid-Atlantic (4): Delaware, New Jersey, New York, Pennsylvania. Southern (5): Georgia, Maryland, North Carolina, South Carolina, Virginia.

2. How many amendments does the Constitution have?

The most common wrong answers are 10 (the Bill of Rights) and 26. Many applicants confuse the total number of amendments with the first 10 amendments.

Memory tip: The 27th Amendment was proposed in 1789 but not ratified until 1992, more than 200 years later. Remember: 27 amendments, and the first 10 are the Bill of Rights.

3. The House of Representatives has how many voting members?

This number is frequently confused with 100 (the Senate) or 538 (the total number of Electoral College electors). The House has had 435 voting members since 1913, permanently fixed at that number by the Permanent Apportionment Act of 1929.

Memory tip: Senate = 100 (2 per state, 50 states). House = 435 (the bigger chamber has the bigger number). Electoral College = 538 (435 + 100 + 3 for Washington, D.C.).

4. The Federalist Papers supported the passage of the U.S. Constitution. Name one of the writers.

The question itself tells you what the Federalist Papers supported — your job is to name one of the writers. It appears on both the 2008 and 2025 tests, and the most common mistake is answering "Thomas Jefferson," who did not write any of the essays.

Memory tip: Three writers, one pen name. Alexander Hamilton, James Madison, and John Jay published the essays under the shared pseudonym "Publius" in 1787-1788 to convince New York to ratify the Constitution. Any one of those four names is a correct answer.

5. How many justices are on the Supreme Court?

The number of Supreme Court justices is not set by the Constitution — it is set by Congress. The current number has been 9 since 1869. Applicants sometimes guess 7 or 12.

Memory tip: The Supreme Court has had 9 justices for over 150 years. A majority decision requires at least 5 of the 9 justices to agree.

6. What is one responsibility that is only for United States citizens?

The tricky part of this question is the word "responsibility." Many applicants confuse rights (freedoms you have) with responsibilities (duties expected of you). Non-citizens have many of the same rights, but serving on a jury and voting in federal elections are reserved for citizens.

Memory tip: Responsibilities are things you are expected to do. Only citizens can sit on a jury or vote in a federal election — these are citizen-only duties.

7. What is one power of the federal government?

Applicants struggle to distinguish federal powers from state powers. States handle things like schools, driver's licenses, and local police. The federal government handles national-level actions.

Memory tip: Think "national-level actions" — only the federal government can print money, declare war, create an army, or make treaties with other countries. If it affects the whole nation or other countries, it is a federal power.

8. There are four amendments to the Constitution about who can vote. Describe one of them.

This question requires knowing specific amendment numbers and what each one did. Many applicants mix up the amendment numbers or cannot recall all four.

Memory tip: Each amendment removed a barrier to voting. 15th = race no longer a barrier. 19th = sex no longer a barrier. 24th = poverty (poll tax) no longer a barrier. 26th = age lowered to 18. You only need to describe one correctly.

9. What territory did the United States buy from France in 1803?

This question is commonly confused with the Alaska Purchase (bought from Russia in 1867) or the acquisition of Florida (from Spain in 1819). The Louisiana Purchase doubled the size of the United States.

Memory tip: France = Louisiana (1803). Russia = Alaska (1867). Spain = Florida (1819). The Louisiana Purchase was made during Thomas Jefferson's presidency.

10. Why does the flag have 13 stripes?

While this seems straightforward, applicants often mix up the stripes and stars. The flag has 50 stars for the 50 current states and 13 stripes for the 13 original colonies.

Memory tip: Stars = current (50 states today). Stripes = history (13 original colonies). This connects directly back to question 1 — the 13 stripes represent the same 13 original states.

Quick Reference: All 10 Questions

How to Study Difficult Questions

Group by category. Study all the number-based questions together — 27 amendments, 435 representatives, 100 senators, 9 justices — so the numbers stop blurring into each other. Then study the list-based questions (13 states, federal powers, voting amendments) as their own block.

Practice out loud. The citizenship test is oral: the officer reads questions and you answer verbally. Studying silently is not enough. Say your answers out loud until you can answer confidently without hesitation.

Use spaced repetition. Review difficult questions every day for the first week, then every other day, then twice a week. Spreading study sessions over time is more effective than cramming.

Test yourself under real conditions. Have someone read questions aloud while you answer verbally. Set a time limit. The more realistic your practice, the more comfortable you will feel on test day.

Test Yourself Now

Try these 10 questions yourself — you can practice free citizenship test questions right now, no account needed. The practice quiz covers both the 2008 and 2025 test versions with instant feedback.

For a complete study experience with all 128 questions on the 2025 test and all 100 on the 2008 test, plus progress tracking and AI-powered mock interviews, download the US Citizenship Test 2026 app. Start with the complete citizenship test study guide for a full preparation plan, or see the differences between the 2008 and 2025 civics tests to make sure you are studying the right version.