Birth of Barack Obama

I don't see the issue here. Even if Barack Obama was not born in Hawaii-which the state says he was-he "acquires" citizenship by the fact that his mother was a US citizen all her life and had never lived out of the country prior to his birth. "Acquisition Citizenship" law requires that a US citizen to have resided in the US for a period of 10 years prior to the birth of a child and that 5 of those years be after the citizen's 14th birthday. Ann Dunham-Barack's mother-was 19 years and 2 months old at the time of Barack's birth. She had lived in Kansas and Hawaii for all those 19 plus years. My information comes from google searches of citizenship requirements. I would really like for someone to explain to me the argument that Barack Obama is not a citizen. As for me, I don't see the issue.