How it fits together
Naturalization is the legal process through which an eligible person who is not already a U.S. citizen becomes one. It is different from receiving a green card, which establishes permanent residence. Other paths to citizenship can involve birth or a citizen parent under the applicable legal conditions.
A closer look
At naturalization, the Oath of Allegiance includes promises to support the Constitution and obey U.S. laws. It is different from the Pledge of Allegiance commonly recited to the flag. The civics questions are study prompts; consult USCIS for the rules that apply to an individual situation.