The French colonial empire was founded on the belief that it was the duty of France to spread its culture and language to the rest of the world.

The British justified their colonization of India by arguing that they were bringing civilization to a backward people. They believed that they had a duty to educate and uplift the Indian people.

Missionaries played a significant role in the spread of colonialism. They helped to spread European culture and values, provided a justification for colonialism, and helped to establish schools and hospitals in the colonies.

The spread of national culture contributed to the rise of nationalism in the colonies in a number of ways. It created a sense of shared identity among the colonized people, led to the development of national liberation movements, and helped to undermine the authority of the colonial powers.

The ultimate goal of the desire to spread national culture was to create a more unified and cohesive nation, increase the power and prestige of the nation, and spread the nation's values and beliefs to the rest of the world.