What is nationalism and imperialism?

Idealistic liberal democratic sentiments because of a narrow creed with limited ends. Nationalist groups became increasingly intolerant of each other and ever ready to go to war.
After 1871 nationalist tension mounted in Europe in the area called Balkan’s. The Balkans was a region of geographical and ethnic variations.
A large part of Balkans was under the contral of the ottoman Empire.
The spread of the ideas of romantic nationalism in the Balkans and downfall of Ottoman Empire made this region very explosive.
As the different Slavic nationalist struggled to define their identity and independence, the Balkans became an area of conflict.
There was intense rivalry among the European powers over trade and colonies.
This led to a series of wars in the region and finally the first world war.
Many countries in the world which had been colonized by the European powers in the 19th century began to oppose imperial domination.
The anti-imperial movements developed nationalism and formed independent nationstates.