Why and how nationalism or ethnicity has reappeared on the global scene? this is an essay question.?

Nationalism has never left the global scene. It has been around in since the first civilization. In modern aspect, nationality has been responsible for the rise of independent nations and also conflict between countries. Take a look at the situation in China, Korea, and Japan. Ethnicity has been an important issue. There is the issue of ethnic oppression, such as the suppression of the Kayins by the Burmese.