let's try to identify the main reasons that changed. How did nationalism come to be such a global force? What changes led to the rise of nationalism as a form of personal identity?

Nationalism didn't used to be that important. Just a few hundred years ago, most people didn't strongly identify with the nation of which they are apart. In this discussion area, let's try to identify the main reasons that changed. How did nationalism come to be such a global force? What changes led to the rise of nationalism as a form of personal identity?