You seem to have gotten 1.5 out of 3. Hitler was not German but was born Austrian. He obviously became a political figure in Germany. I do not know what Germanys election laws were at the time.

Napolean was born in Corsica which was part of Italy at the time of his birth but then became part of France so he was in fact then a French citizen when he joined the French army and began his rise to power.

President Obama was born in Hawaii which was part of the United states at the time so he is a US citizen. I know there is a lot ot mis-information about that but he is a US citizen.