That's because of the LIBERAL LIE that we have no culture in this country.
It is the same liberal lie they use in every 'new world' country.The 'we're a nation of immigrants' line is used to prop-up everything new and different(no matter how negative its effects on society) and deride everything that is traditional.Multiculturalism,since the 1960s,has stunted the cultural development of all 'new world' countries.Anyone whose ancestry traces back further than a couple of generations in a new world country has been dispossesed of their identity and turned into cultureless 'hosts'.
Multiculture=no culture.