Okay, buddy! Cultural nationalism is when people really love and feel proud of their country's culture. This can mean things like language, food, music, clothing, and traditions that are unique to their country.
For example, imagine your favorite food is pizza and you really love everything about it - the dough, the cheese, the sauce, and all the delicious toppings you can add. Cultural nationalism is like feeling the same way about food, music, language, and customs that come from your country.
People who are really into cultural nationalism believe that their country's culture should be celebrated and protected. They might want to make sure that everyone in their country speaks their language, wears traditional clothes, and listens to their country's music. They might also want to make sure that outsiders don't come in and change things too much.
Does that make sense to you, little buddy?