The first example of an international organization is the Central Commission for Navigation on the Rhine (CCNR), which was created in 1815 by the Congress of Vienna. After the Second World War, there has been a tremendous growth in the number of international organizations. Such organizations may be either universal (such as the UN and the ILO) or regional (such as the European Union and the African Union). International organizations are established by treaties and their international personality can be ascertained by looking at their constitutions.