First of all we do not know who he is, but let's go with the narrative that he was born on a tropical island to a white woman and a black Kenyan on Aug 4, 1961.
This was posted on Zippo's campaign website in '08, no longer there but FactCheck had posted it in reply to a story in the Rocky Mountain News that Barack Obama "Holds both American and Kenyan (since 1963) citizenship."
When Barack Obama Jr. was born on Aug. 4,1961, in Honolulu, Kenya was a British colony, still part of the United Kingdoms dwindling empire. As a Kenyan native, Barack Obama Sr. was a British subject whose citizenship status was governed by The British Nationality Act of 1948. That same act governed the status of Obama Sr.s children.The Kenyan constitution does state that if you do not denounce your other citizenship and swear an oath to Kenya then your citizenship does in fact expire. Originally it was listed on his 21st birthday but then corrected because of a 2 year grace period to Aug 4, 1984. Big deal Greg...Well it is. Enter the British Nationality Act of 1981.British Nationality Act of 1948 (Part II, Section 5):
Subject to the provisions of this section, a person born after the commencement of this Act shall be a citizen of the United Kingdom and Colonies by descent if his father is a citizen of the United Kingdom and Colonies at the time of the birth.
Every person who (a)under [F105the British Nationality Acts 1981 and 1983][F106or the British Overseas Territories Act 2002] is a British citizen, a [F107British overseas territories citizen] , [F108a British National (Overseas),] a British Overseas citizen or a British subject; or (b)under any enactment for the time being in force in any country mentioned in Schedule 3 is a citizen of that country, shall have the status of a Commonwealth citizen.emphasis mine
The UK was terminating the title of "subject" and replacing it with "Commonwealth Citizen" in this act. So the date above is relevant because the commencement date of the BNA 1981 was Jan 1, 1983 while Obama was still considered a Kenyan Citizen thus being a British Subject then became a "Commonwealth Citizen" of the UK.
He is not a US Citizen if we believe the phony birth certificate or we don't. And I'll never get back the time I have spent on this subject....