Oceanian culture encompasses the collective and diverse customs and traditions of art, architecture, music, literature, lifestyle, philosophy, politics and religion that have been practiced and maintained by the numerous ethnic groups of the geographical region of Oceania since prehistory. Cultures of Oceania reflect not only that of the region's indigenous peoples, but those cultures that followed European colonisation as well; and the United States, particularly via mass culture such as cinema and TV. Oceania is commonly divided into four geographic sub-regions, that are characterized by perceivable commonalities, like culture, religion, language and relative ethnic (racial) homogeneity. These regions are Australasia, Melanesia, Micronesia, and Polynesia.