Thanks all for your valuable comments. In one hand it's difficult to give up Nepali nationality but then when you think about it,  I can always say I'm from Nepal since noone can take that away coz that's where I'm from

Even if I did take citizenship, how would anyone know that I have taken it? I would still have my Nepali passport so how could I lose my property in Nepal. I think as long as I don't tell anyone I can have the best of both worlds.

Am I wrong? Is there anyways Nepali govt would know I have become US citizen???