Role of Nationalism in The 19th Century Paper

I’m working on a History question and need guidance to help me study.

(1)Evaluate the role of nationalism in the 19th century, in relation with the formation of contemporary international system. Compare it with contemporary nationalism.Make an evaluation of about 300 words

(2Let your answer be based mostly on Europe.

I already put up the topic under which the question was asked(i.e. the historical context of contemporary international relations