I suggest you post this question again under the immigration heading. Good luck!
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As to being divorced, at your Natz interview they will ask you about this prior marriage - CIS will want to make sure the marriage which conferred upon you your Green Card was indeed legitimate and entered into in good faith. So, do expect to answer questions about the legitimacy of your prior marriage and the reasons for the divorce. As to the low taxes, the Natz application asks whether you have ever failed to file taxes since becoming a permanent resident - so long as you haven't you are OK as the fact that your taxes are low are not an impediment to becoming a USC. You should owe no money to the IRS and I hope you haven't received government benefits either. Best of luck!
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