The Dutch East Indies, or Netherlands East Indies, (Dutch: Nederlands-India; Indonesian: Hindia-Belanda) was the Dutch colony that became modern Indonesia following World War II. It was formed from the nationalised colonies of the former Dutch East India Company that came under the administration of the Netherlands in 1800. During the 19th century, Dutch possessions and its hegemony were expanded, reaching their greatest extent in the early 20th century, defining the borders of modern-day Indonesia. The colony was based on rigid racial and social categorisations with a Dutch elite living separate from but linked to their native subjects. Following the Japanese occupation during World War II, Indonesian nationalists declared independence in 1945. This resulted in the Indonesian National Revolution which ended when, under the auspices of the UN, the Dutch-Indonesian Round Table Conference formally recognised Indonesian sovereignty on December 27, 1949 with the exception of the Netherlands New Guinea (Western New Guinea). The Netherlands agreed to the New York Agreement which ceded the territory to Indonesian administration in May 1963.