The above assertion is absolutely true.
- Nationalism is an ideology that emphasizes loyalty, devotion, or allegiance to a nation or nation-state and holds that such obligations outweigh other individual or group interests.
- It truly encourages pride among a nation's citizens who are in love with their country.
- It also preserves our history.
- So, it is true
Hope you could get an idea from here.
Doubt clarification - use comment section.