ELI5: Explain Like I'm 5

Expansionist nationalism

Expansionist Nationalism is a type of belief or feeling that a person can have about their country. It means that people think their country should be bigger and more powerful, by taking over or adding more land or power. This idea says that the people of a country should fight for their land and that it should expand as far as possible. Expansionist Nationalism can lead to wars between countries because each country is trying to gain more.