Federalism was implemented in Indonesia in the range of 27 December 1949, to 17 August 1950. At this time, what was used as a guide was the 1949 Constitution United States of Indonesia. Based on the constitution, the form of the Indonesian state is a union or federation consisting of 15 states. The Republic of the United States of Indonesia is a federated state as a result of the agreement of the three parties in the Round Table Conference, namely Indonesia, BFO, and Netherlands. This agreement was also witnessed by United Nations Commission for Indonesia (UNCI) as the representative of UN.