Quote Originally Posted by Watchman View Post
The kinds of ideas about closer economic cooperation across state borders that the EU stems from were being floated around already in the interwar period, you know. One reason was that the benefits of scale the US derived from the sheer size of its internal market were not lost on Euro economists.

Anyway, what can be regarded as the concrete first step in the chain that led to the present EU was the Coal And Steel Union formed between France, Germany, the Benelux countries and maybe someone else (can't be arsed to check the details ATM) shortly after the war; the direct impetus was a distruption in the supply of English coal due to domestic reasons that put French industry in a tight spot, and convinced them to start looking for alternate suppliers and arrangements.

Furuncu wasn't entirely incorrect, however, as one important consideration in the various postwar cooperative agreements indeed was binding the interests of at least the big boys of the block (initially France and Germany) so closely that they'd be flat out forced to cooperate and compromise with each other in the future. The downsides of confrontational competition and "me-firsting" had, after all, become demonstrated concretely indeed in the recent few decades...
from wiki:
1945–1957: Peace from coal and steel
After two devastating world wars, the political climate favoured an international unity that ensured peace. (bombed Hamburg in 1943)

Main article: History of the European Communities (1945-1957)

World War II from 1939 to 1945 saw a human and economic cost which hit Europe hardest. It demonstrated the horrors of war and also of extremism, through the holocaust, for example. Once again, there was a desire to ensure it could never happen again, particularly with the war giving the world nuclear weapons. The countries of Western Europe failed to maintain their Great power status leaving two rival ideologically opposed superpowers.[2].

To ensure Germany could never threaten the peace again, its heavy industry was partly dismantled (See: Industrial plans for Germany) and its main coal-producing regions were detached (Saarland, Silesia), or put under international control (Ruhr area).[3] (See: Monnet plan)

With statements such as Winston Churchill's 1946 call for a "United States of Europe" becoming louder, in 1949 the Council of Europe was established as the first pan-European organisation. In the year following, on 9 May 1950, the French Foreign Minister Robert Schuman proposed a community to integrate the coal and steel industries of Europe - these being the two elements necessary to make weapons of war. (See: Schuman declaration).
Robert Schuman proposed in May 1950 the Coal and Steel Community.

On the basis of that speech, France, Italy, the Benelux countries (Belgium, Netherlands and Luxembourg) together with West Germany signed the Treaty of Paris (1951) creating the European Coal and Steel Community the following year; this took over the role of the International Authority for the Ruhr[1] and lifted some restrictions on German industrial productivity. It gave birth to the first institutions, such as the High Authority (now the European Commission) and the Common Assembly (now the European Parliament). The first presidents of those institutions were Jean Monnet and Paul-Henri Spaak respectively.

After failed attempts at creating defence (European Defence Community) and political communities (European Political Community), leaders met at the Messina Conference and established the Spaak Committee which produced the Spaak report. The report was accepted at the Venice Conference (29 and 30 May 1956) where the decision was taken to organize a Intergovernmental Conference. The Intergovernmental Conference on the Common Market and Euratom focused on economic unity, leading to the Treaties of Rome being signed in 1957 which established the European Economic Community (EEC) and the European Atomic Energy Community (Euratom) among the members.[4]