Considering the research gap in mind, this study has been designed in terms of three specific objects. Firstly, the book has investigated whether the process of transition from the Hindu Monarchy to the Secular Republic has a correlation with the growth of ethnic assertiveness in Nepal. Secondly, the study has tested the process of constitution-making in particular and Nation-building in general in the light of ethnic politics in Nepal. Thirdly, this inquiry has appraised the demand of ethnic federalism as a means to achieve more inclusive, institutionalized and sustainable democratic polity in Nepal. Finally, the book has ended with a summary of major findings and the prescription of some important policy recommendations.