Brussels and the European Union a provisional seat, though with the Common Assembly in Strasbourg as that was the only city with a large enough hemicycle (the one used by the Council of Europe). This agreement was temporary, and plans were set to relocate the institutions to Saarbrücken which would serve as a "European District", but this did not occur. The 1957 Treaties of Rome established two new communities, the European Economic Community (EEC) and the European Atomic Energy Community (Euratom). These shared the Assembly and Court of the ECSC but created two new sets of Councils and Commissions (equivalent to the ECSC's High Authority).
Convention on the association of the Netherlands Antilles with the European Economic Community that it was "entitled" to do so. Applying the treaty to the Netherlands Antilles by Supplementary Act to the instrument of ratification turned out to be an impossibility, as the other five Member States of the Community wanted some safeguards with regard to the import of petroleum products refined in the islands, and thus a full treaty revision according to Article 236 of the EEC Treaty had to be negotiated. The Kingdom of the Netherlands proposed a treaty revision on 4 June 1962. This proposal was met with favourable responses from the Commission, the Assembly, and the Council on 10