How to understand that culture is an important feature of a nation?

Culture is an important feature of a nation, the product of a nation's long-term production and life, and the soul and blood that sustains a nation's survival. Generally speaking, all ethnic groups have the same historical origin, mode of production, language, culture, customs and psychology, and some ethnic groups play an important role in its formation and development. Among these characteristics of a nation, language, customs, religious beliefs, psychological quality and other characteristics are mostly expressed in the form of culture, and the historical origin and mode of production of a nation are also accumulated in the national culture to varying degrees.