This article is from the FAQ, by with numerous contributions by others.
N-400 : Application for Naturalization
N-600 : Application for Certification of Citizenship
I-90 : Application to Replace Alien Registration Card
I-130 : Petition of Alien Relative
I-131 : Application for Travel Document
I-485 : Application to Register Permanent Residence
or Adjustment of Status
I-600 : Petition to Classify Orphan as an Immediate Relative
I-765 : Application for Temporary Employment Authorization
 
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