Is it permissible to separate from one's husband solely because he is Iranian?

The marriage is valid if it was conducted with authorization from your guardian and two witnesses. The determining factor is the groom's state at the time of the contract. If he does not hold the disbelief-inducing beliefs of the Shia, then there is no harm in marrying him. Documenting the marriage is obligatory in this era due to the corruption of consciences and for the preservation of rights. If you have documented your marriage at the Islamic Center and with official American papers, this is sufficient. You should strive to document it in your home country. It is not permissible for a woman to seek divorce except for a justifiable excuse, based on the Prophet's (peace be upon him) saying: "Any woman who asks her husband for a divorce without any strong reason, the scent of Paradise will be forbidden to her." Your inability to register the marriage in your home country is not an excuse that permits divorce, as long as the marriage is documented in your current place of residence.