A military-led uprising overthrew Portugal’s Estado Novo dictatorship, beginning democratisation and reorienting foreign policy toward Western European integration—an essential precondition for later EEC membership.
The death of Francisco Franco ended decades of dictatorship and set Spain on a transition toward democratic institutions, strengthening the political case for EEC accession.
Portugal submitted its formal application to join the European Communities, making EEC membership an explicit national objective in the post-revolution democratic period.
Spain’s democratic government formally applied to join the European Economic Community, signalling that EEC accession was a strategic anchor for democratic consolidation and economic modernisation.
The two Iberian democracies signed a bilateral Treaty of Friendship and Cooperation, reinforcing political cooperation as both pursued European integration pathways.
The European Commission delivered its opinion on the implications of Portugal’s accession, an important step toward moving from application to negotiated accession terms.
Following a favourable Council response, accession negotiations with Portugal were officially opened, launching the detailed, chapter-by-chapter process of aligning Portugal with Community rules and policies.
The European Commission submitted its opinion on Spain’s membership application to the Council, recommending the opening of accession negotiations while highlighting significant economic and institutional implications.
Negotiations with Spain opened in Brussels, beginning an extended process to settle major issues such as agriculture, fisheries, industrial adjustment, and transition periods.
After the failed coup attempt in Spain, the European Council publicly welcomed the defence of Spain’s democratic system—underlining the political stakes of Iberian accession during negotiations.
The ten member states and the two candidate countries reached a political agreement on key outstanding areas (including agriculture and fisheries), clearing the way for finalising the accession treaties.
Spain and Portugal signed the treaty to accede to the European Economic Community (and Euratom), formalising terms negotiated over years and setting 1 January 1986 as the entry-into-force date.
In the United Kingdom, parliamentary debate on implementing legislation for Spanish and Portuguese accession reflected the final ratification phase across member states required before entry into force.
The accession treaty entered into force, making Spain and Portugal full members of the European Communities and expanding membership from 10 to 12—an emblematic enlargement linked to consolidating Iberian democracies.
Spain and Portugal accession to the EEC (1975–1986)
