multiculturalism

noun2

1. •
   The characteristics of an organization, society, city etc. which has many different ethnic or national cultures mingling freely; political or social policies which support or encourage such coexistence.

   • The truth is that diversity, a kind of multiculturalism if we want to call it that, is the norm in any society. — 1984
2. •
   (informal, offensive) The cultural Marxism conspiracy theory.