@Jeremy *******
for one, a Thai women applying for a k1 visa when she is legally married in her home country. To even be eligible BOTH parties need to show they are free and legally able to marry.
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I was incorrect about the legally obligated to register part. "If you would like to register your marriage in the United States, you must contact the Attorney General in your state of residence to inquire about their specific documentary requirements." It does not say that you need to.
That does not mean it is not recognized. "Most states recognize the validity of legal marriages registered in Thailand."
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Also, when an American files their taxes and are legally married there are 3 filing statuses available. All of which require some declaration of marriage in some form. You cannot file single.
Unless you think it's legal to lie on taxes and government applications?