If you pulled a marriage license, and then went through a ceremony back in 2010, then the marriage was presumably lawful, making your later marriage elsewhere bigamous and void under American law (sex, cohabitation, and pretty much anything else, is irrelevant).
I cannot answer your immigration question, but I strongly suggest that you have your first marriage annulled in Nevada, which you can arrange to do while you are overseas, and then remarry your current spouse. For some background, see http://willicklawgroup.com/annulment/.
Answered on May 03rd, 2014 at 4:05 PM