400
Before the 19th century, people might have been loyal to a local leader or a king, or shared cultural values within a city or an empire; rarely, however, did they have a national identity. This changed in the 19th century, as various societies around the world became increasingly nationalist. ___________________________ , one of the most influential forces of the 19th century, is the high value placed on a shared identity based on geography, culture, and politics.
Nationalism