National romantic style is a way of making things, like buildings or art, that make people feel proud of their country. It's like when you draw a picture of your family and you make sure to include things that represent who you are, like your dog or your favorite toy. People who use national romantic style do the same thing, but with their whole country.
They use special designs and decorations that show off the history and culture of their nation. For example, if they were from a country with lots of trees and mountains, they might use those things in their designs. They might also use special colors or patterns that represent their country.
This style became really popular in Europe in the 1800s and early 1900s. People wanted to show their pride in their country and make their buildings and art look special. This style can still be seen in some places today, especially in parts of Europe, where people want to remember their history and culture.