The company certainly can sue you if you leave - your credit card contract gives a locality here in the US jurisdiction (probably DE or SD) in the event you leave the country. They'll simply obtain a default judgment against you. Now, I don't know if they'll go to that extreme if they cannot personally locate you in the US, but it is possible. That said, they certainly could come after you if you return to the US in 2 years - the SOL certainly won't have run out by then. And, I can tell you that with defaulted debt on your credit history, gaining employment will be very difficult, and it certainly can be a consideration is making a visa decision.
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On the visa status I am unsure how that would effect you if they got judgments. If you leave the country and don't pay then they eventually will get around to sue you and get default judgments. On coming back and getting a job an employer may take that into account that you have judgments against you in making a hiring decision or supporting your work status here. You will still be liable on the credit card debt after two years as the Statute of Limitations will not of run even if they don't sue you. It is rather unlikely that a Credit Card or collection law firm would enforce a judgment overseas but you never know. If you could postpone your leaving the country it is possible to file a Chapter 7 bankruptcy. Or perhaps the country you are from has bankruptcy which most countries do and then you could file there.
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