The French political scientist and economist Bertrand Jouvenel remembered a widespread mood after 1924 calling for a "harmonisation of national interests along the lines of European union, for the purpose of common prosperity".
"[8] Eleftherios Venizelos, Prime Minister of Greece, outlined his government's support in a 1929 speech by saying that "the United States of Europe will represent, even without Russia, a power strong enough to advance, up to a satisfactory point, the prosperity of the other continents as well".
[9] Between the two world wars, the Polish statesman Józef Piłsudski (1867–1935) envisaged the idea of a European federation that he called Międzymorze ("Intersea" or "Between-seas"), known in English as Intermarium, which was a Polish-oriented version of Mitteleuropa.
The plans for German-oriented political, social, and economic integration of Europe – such as the New Order, the Greater Germanic Reich and Generalplan Ost – did not survive the war.
At the end of World War II, the continental political climate favoured unity in democratic European countries, seen by many as an escape from the extreme forms of nationalism which had devastated the continent.
[11] The same speech however contains remarks, less-often quoted, which make it clear that Churchill did not initially see Britain as being part of this United States of Europe: We British have our own Commonwealth of Nations ... And why should there not be a European group which could give a sense of enlarged patriotism and common citizenship to the distracted peoples of this turbulent and mighty continent and why should it not take its rightful place with other great groupings in shaping the destinies of men? ...
Great Britain, the British Commonwealth of Nations, mighty America[,] and I trust Soviet Russia—for then indeed all would be well—must be the friends and sponsors of the new Europe and must champion its right to live and shine.
[13] One of the most influential theories of European integration is neofunctionalism, influenced by functionalist ideas, developed by Ernst B. Haas (1958) and further investigated by Leon Lindberg (1963).
[19] The other big influential theory in Integration Studies is Intergovernmentalism, advanced by Stanley Hoffmann after the Empty Chair Crisis by French President Charles De Gaulle in the 1960s.
These are Austria, Belgium, Bulgaria, Croatia, Cyprus, Estonia, Finland, France, Germany, Greece, Italy, Ireland, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Portugal, Slovakia, Slovenia and Spain.
It comprises Denmark, Sweden and Norway as foundational states; further, it includes Finland and Iceland since 24 September 1965, and the Danish autonomous territories of Faroe Islands since 1 January 1966.
Through the integration, the countries in Eastern Europe have experienced growth of the economy, benefits of the free market agreements and freedom of the labor movement within the EU.
In accordance with its Statute of 1949, the Council of Europe works to achieve greater unity among its members based on common values, such as human rights and democracy.
Thus, 12 states are founding members, namely, Belgium, Denmark, France, Germany, Greece, Ireland, Italy, Luxembourg, the Netherlands, Portugal, Spain, and the United Kingdom.
Official candidate states include Albania, Bosnia and Herzegovina, Georgia, North Macedonia,[a] Moldova, Montenegro, Serbia, Turkey and Ukraine.
According to the European Union's official site, and a statement by Commissioner Günter Verheugen, the aim is to have a ring of countries, sharing EU's democratic ideals and joining them in further integration without necessarily becoming full member states.
The creation of the EEC eliminated tariffs, quotas and preferences on goods among member states, which are the requisites to define a free trade area (FTA).
This seeks to guarantee the four basic freedoms, which are related to ensure the free movement of goods, services, capital and people around the EU's internal market.
Outside the EU, agreements have been concluded with Andorra, Monaco, San Marino, and Vatican City for formal adoption, including the right to issue their own coins.
The Bologna declaration was signed in 1999 by 29 countries, all EU members or candidates at the moment (except Cyprus which joined later) and three out of four EFTA countries: Austria, Belgium, Bulgaria, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, and United Kingdom.
In 2003, Albania, Andorra, Bosnia and Herzegovina, the Holy See (a Council of Europe permanent observer), North Macedonia,[a] Russia, and Serbia signed the convention.
The European Health Insurance Card (or EHIC) is issued free of charge and allows anyone who is insured by or covered by a statutory social security scheme of the EEA countries and Switzerland to receive medical treatment in another member state for free or at a reduced cost, if that treatment becomes necessary during their visit (for example, due to illness or an accident), or if they have a chronic pre-existing condition which requires care such as kidney dialysis.
This is linked to the concept of Multi-speed Europe where some countries would create a core union; and goes back to the Inner Six references to the founding member states of the European Communities.
Further, some countries which do not belong to the EU have joined several of these initiatives, albeit sometimes at a lower stage such as the Customs Union, the Common Market (EEA), or even unilaterally adopting the euro, and by taking part in Schengen, either as a signatory state, or de facto.
Meanwhile, the post-Soviet disputed states of Abkhazia, Artsakh, South Ossetia, and Transnistria have created the Community for Democracy and Rights of Nations to closer integrate among each other.
[74] On 2 March 2024, Armenian Prime Minister Nikol Pashinyan advised that Armenia would officially "apply to become a candidate for EU membership in the coming days, within a month at most".
[96] French president Nicolas Sarkozy in 2010 said he believed in 10 or 15 years there will be common economic space between EU and Russia with visa-free regime and general concept of security.
[100] Morocco already has a number of close ties with the EU, including an Association Agreement with FTA provisions, air transport integration, or the participation in military operations such as ALTHEA in Bosnia.
The post-Soviet disputed states of Abkhazia, South Ossetia, and Transnistria are all members of the Community for Democracy and Rights of Nations which aims to forge closer integration.
The EU and African, Caribbean and Pacific Group of States form the ACP–EU Joint Parliamentary Assembly, promoting ACP–EU development cooperation, democracy and human rights.