There are no US laws that dictate how many times a person may marry. The only requirement is that the previous marriage is legally dissolved according to the laws of the state in which the divorce decree is granted. In cases where a US citizen has multiple marriages to foreign nationals (not just one individual) it is likely that the department of Immigration and Customs (ICE)would take an interest in the matter if they became aware of the situation. It is against federal law for a US citizen to enter into a marriage of convenience with a foreign national whether or not financial issues are involved. Such acts are considered a criminal felony offense of federal law and if a person is convicted of the charge he or she can be imprisoned for ten or more years and/or fined hundreds of thousands of dollars.