There are
national cultures, like what some have called
civil religions, that mark all nations, or peoples.
These affect even such cultural melting pots as the United States. While such beliefs may not be explicitly held by individuals, most, if not all, aspire to the cultural goals contained in such a civil religion, or share some part of it implicitly.
This is the drumbeat of all the tools of culture, primarily media, but also schools and universities and government.
Such notions as American Democracy, American media, the democratizing burden that Americans must bear, are elements of the American civil religion.
When cultures, such as the American culture, lose sight of the fact that its culture is a national culture, and instead see only a universal culture, with its necessary concomittant the democratizing burden, that breeds cultural imperialism.