His mother did not have enough age - years living in U.S. to confer her U.S. citizenship to Obama Jr. Obama Sr. was married in Kenya and the U.S. does not honor polygamy. So they were never married.
Conflicting immigration and family laws left a legal question whether a single mother with newborn could pass her citizenship due to point above.
“His mother did not have enough age - years living in U.S. to confer her U.S. citizenship to Obama Jr.”
So an 18 year-old woman can’t give birth to an American? Amazing.