This paper is intended to examine as a preparatory work the concept of nationalism, preceding the study on "The Modernization of Japan and Nationalism". Firstly, we have analyzed the meaning of "nationalism". We therefore had to begin by defining "nation", which is the origin of the term "nationalism". We have also given a general definition to "nationalism": it "aims at unification, independence and development of a nation, and it is the ideology and movement which push them forward." Furthermore, we have mentioned the diffirence between "nationalism" and 'patriotism." Secondly, we have examined the formation and development of modern European Nationalism. It is important to note that it's rise is unnoticeable until the Absolutism of the s...