Heya your answer goes like this -

During the last 200 years nationalism has emerged as one of the most compelling of political creeds which has helped to shape our history through the COURSE of time. The study of term ‘Nationalism’ has inspired intense loyalties as well as hatred and criticism. It unites people into BOND on the basis of shared BELIEF, common territory, shared political idea and aspirations. Nationalism has been a factor in the breakup of EMPIRES and states. Nationalist struggles have contributed in the drawing and redrawing the state boundaries of the states and empires. The idea of nationalism liberates people from the bond of various smaller GROUPS to a one wide nation where they all share common interest and goal. It can sometime divide the lingual and culture group which can demand for a separate nation state like we have seen in the case of Telangana which resulted in disintegration of Arunachal Pradesh, this is a great threat to the nationalism as it generates bitterness and conflict as demands for separate nation state demanded by the smaller groups and communities arises. Such situations are the roots of many going conflicts in today’s time.