US Law very clearly stipulates: “If only one parent was a US citizen at the time of your birth, that parent must have resided in the United States for at least ten years, at least five of which had to be after the age of 16.”
Barack Obama’s father was not a US citizen, and Obama’s mother was only 18 when he was born, which means although she had been a US citizen for 10 years, his mother fails the test for being so for at least 5 years prior to Barack Obama’s birth.
In order for her child to have been a natural-born US citizen, his mother would have had to be 21 at the time of his birth.
In essence, Mrs. Obama was not old enough to qualify her son for automatic US citizenship.
His mother would have needed to have been 16+5 = 21 years old at the time of Barack Obama’s birth for him to have been a natural-born citizen.
Barack Obama instead should have been naturalized, but even then, that would still disqualify him from holding the office of President under current law.
