Form N-400
Form N-400, Application for Naturalization
The same few things, over and over — and every one of them is a completeness problem the software checks for before your packet is marked ready.
Watch for
An incomplete travel list — USCIS has entry records and compares
Unaddressed tax issues instead of documented payment plans
For men who lived in the U.S. between 18 and 26: the Selective Service question left unexplained
Filing earlier than the 90-day early window allows
Form N-400
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