Yes, the U.S. recognizes the universal legitimacy of marriage.
Yes. Unless you marry with a person of the same sex, which is possible in Belgium, but not in the US.
marry him
Yes you CAN marry, but that will NOT give him LEGAL status.
yes you can
NO!
No, it is not legal to marry one's granddaughter in Kansas. In all states in the United States, such marriages are considered incestuous and are prohibited by law.
It differs from state to state.
No
Of course it is
According to CousinCouples.com, second cousins can marry anywhere in the US.
Yes
As long as the marriage is legal. Then your passort is legal.