Nationalism: It is a belief system which instills a sense of common identity among the members of a nation. National flag, national symbol, national anthem, etc. play an important role in developing and strengthening the idea of nationalism.
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Nationalism refers to the devotion for one's own nation's interests over those of all other nations. It was an important factor in the development of Europe. In the 19th century, a wave of romantic nationalism swept the European continent, transforming its countries. Some newly formed countries, such as Germany, Italy and Romania were formed by uniting various regional states with a common "national identity". Others, such as Greece, Poland and Bulgaria, were formed by uprisings against the Ottoman Empire and Russia. More concisely, nationalism better defined these countries.