Evaluate the political role of nationalism in the 19thcenturywas it more important as a force for unification or disintegration?

Evaluate the political role of nationalism in the 19thcenturywas it more important as a force for unification or disintegration? Please explain how the ideology of nationalism transformed into a means to create unified states (using either Italy or Germany as an example) but break down other empires (usingeither the Austrian or Ottoman empires as example.) What role did modern nationalism play in the transition to independence in Asia, Africa and the Middle East in the 20th century