Jedi Master, US is giving you citizenship because it will gain more from you than it loses to you. Most of the money you make in the US again returns to its economy because everything is expensive here and the little money you earn here and send to or invest in Nepal is nothing for US economy. America is the most powerful country so it's internal and external security is not affected by granting citizenship to foreigner. It is also the largest economy in the world and immigrants can not do any harm or influence American policy or whaterver to America whether they love to America or not. America is a large fish and you know large fish in a pond always survives so it does not worry about mixing up with small fishes. But, being a small fish, you should always be alert and take precaution well in advance. Expecting whatever applies to America applies to Nepal exactly in the same way is just stupidity and we, as a small and weak country, should avoid taking any such risk.