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After the end of the Second World War, moves towards European integration were seen by many as an escape from the extreme forms of nationalism which had devastated the continent. One such attempt to unite Europeans was the European Coal and Steel Community which, while having the modest aim of centralised control of the previously national coal and steel industries of its member states, was declared to be "a first step in the federation of Europe". The founding members of the Community were Belgium, France, Italy, Luxembourg, the Netherlands and West Germany, led by Konrad Adenauer, Sir Winston Churchill, Alcide de Gasperi, Walter Hallstein, Jean Monnet, Robert Schuman, Paul Henri Spaak, and Altiero Spinelli.
二次大戰之後, 歐洲各國避免相互之間競爭, 希望在戰爭中恢復過來, 最初於1948年由荷蘭、比利時、盧森堡三國組成嘅關稅聯盟,主要係免除關稅,開放原料、商品嘅自由貿易。到1951年,荷蘭、比利時、盧森堡、法國、義大利、德國成立歐洲煤鋼共同體(ECSC),合作推動煤與鋼鐵嘅生產銷售。1957年六國在羅馬簽署《羅馬條約》(Treaty of Rome),1958年正式成立歐洲經濟共同體(EEC)和歐洲原子能共同體,旨在創造共同市場,取消會員國間嘅關稅,促進會員國間勞力、商品、資金、服務嘅自由流通。