Posted earlier.
When Barack Obama was born in 1961, U.S. citizenship law provided that, if born abroad, he would have acquired citizenship at birth only if his mother, Stanley Ann Dunham, had been physically present in the United States for 10 years, five after the age of 14. She was only 18 when he was born and thus could not have transmitted U.S. citizenship to him. But he did become a citizen at birth by virtue of being born in Hawaii two years after it was admitted to the union.
https:// www.washingtonpost.com/opinions/obamas-mother-and-us-citizenship/2011/05/09/AFUqN02G_story.html?utm_term=.f6da6b487e33