Japan's World War II occupation dismantled much of the Dutch colonial state and economy. Following the Japanese surrender in August 1945, Indonesian nationalists declared independence which they fought to secure during the subsequent Indonesian National Revolution. The Netherlands formally recognized Indonesian sovereignty at the 1949 Dutch–Indonesian Round Table Conference with the exception of the Netherlands New Guinea (Western New Guinea), which was ceded to Indonesia 14 years later in 1963 under the provisions of the New York Agreement.