<human>:  When did nationalism start to become a major political force?
<bot>: Nationalism has been a major political force in Europe since the late 19th century. In fact, it is still a big deal in Europe today. Nationalism is a belief that one’s nation is superior to other nations. The rise of nationalism was spurred by the industrialization of Europe and the increase in immigration into the continent. Nationalism was also fueled by the desire to expand one’s borders and gain control of new territories. Nationalism is a big deal in Europe today, and it is a major political force in the United States as well.