It depamds on how do u define
Life n Happiness.
1. U r in USA : U already secured top position ( if u think Prime minister is happier because he is PM, but he might forget the happiness of becoming PM and sad because of tremendous tension .)
2. If u give more importance to your personal life and comfort u achieved, then u would be happy here, u r living in the county where u can get whatever u want if u have money to spend. n compar with Nepal water, electricity, pollution n security ( although u feel more unsecured here with gun, u can say Nepal is unsecured )
3. And finally if u give more importance to become important man among own society, u r no-man here, u would be too happy for small achievement among your known family n society. Nothing give you more happyness other than sharing your happyness with your near n dear family n friends.
4. Migration already made your life complex, returning back to Nepal is like abducting position of PM ( your society does not like it) and but it is also a way of getting happyness in life if r metally prepared to go back to Nepal.
5 American life is best if n only if u r american by blood n heart. U will be american because u live in america or have green card/citizenship.