Posted by: sojoketo September 27, 2015
permanently going back to Nepal
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may be this helps
http://travel.state.gov/content/travel/en/legal-considerations/us-citizenship-laws-policies/renunciation-of-citizenship.html
Regarding coming back to Nepal, I understand you need to have tourist visa to enter but I am not sure.
May be Nepalese embassy could help although the possibility is less than 5%
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