sentences:  For a state to join the European Union, the prior approval of all current member states is required.In addition to enlargement by adding new countries, the EU can also expand by having territories of member states, which are outside the EU, integrate more closely (for example in respect to the dissolution of the Netherlands Antilles) or by a territory of a member state which had previously seceded and then rejoined (see withdrawal below).Each state has representation in the institutions of the European Union.