quality:corruption, structural:expansion, structural:reformatting
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 many ethnic groups of the geographical region of Oceania since prehistory. Cultures of Oceania reflect not only that of the region's indigenous peoples, but also the cultures brought by European colonisation and the United States, particularly through mass culture such as cinema and TV. Oceania is commonly divided into four geographic sub-regions, characterized by shared cultural, religious, linguistic, and ethnic traits: Australasia, Melanesia, Micronesia, and Polynesia. Most Oceanian countries are multi-party representative parliamentary democracies, and tourism is a large source of income for the Pacific Islands nations.