This from Ancestery.com:
Wow, I should not be surprised because many Americans who are part of families that have been here in this country for centuries are also descended from African slaves - even white Americans. It used to be we went with the "one-drop" rule in America, but now that it's obvious that more people would be considered black who have white skin, no one seems to bring it up anymore. So yup, our first President of African-descent is also the descendant of a slave. He's definitely an American.We explored thousands of historical documents in our research and discovered that John Punch, the first African enslaved for life in America, was the 11th great-grandfather of President Barack Obama.
President Obama's Great Grandfather On His Mother's Side Was A Slave