“Wasn’t there evidence that Chester Arthur was born in Canada? Also, what about the Kenyan-born current occupant of the WH?”
Chester Arthur was born in the United States with British parents, British citizenship, and no U.S. citizenship of any kind. His mother was a natural born citizen of the United States, but she lost her U.S. citizenship when she married her British citizen husband in Quebec, Canada. Consequently, her son was born in the United States without U.S. citizenship.
if we accept the common law understanding of natural born citizen, he was a natural born US citizen by virtue of having been born on US Soil however.