Barry Soetoro returned to Hawaii as an unaccompanied minor in 1971. He was taken into Federal Protective Custody. Eventually, he became a Permanent Resident Alien of the U.S. shortly after that.
When he was 15,16, his legal custodian (located in Connecticut) filed for a SSN for him. Permanent Resident Aliens are allowed to apply for and receive an SSN.
http://www.cppp.org/repatriation/Backgrounder2.pdf
what are you talking about, why would obama be placed in federal protective custody? He had a mother and father in Indonesia. Were are the records of his permanent residency? What is his A number? Where are the records of his naturalization? Where are the records of his guardianship? Who claimed him on their tax records? Fill in some big blanks.