The article discusses the significant economic and social transformations in Spain and Portugal since their accession to the European Economic Community in 1986. Initially struggling with high unemployment and low GDP, both countries have seen substantial growth, aided by EU funds. Spain's GDP increased sixfold, while Portugal's doubled, improving living standards and infrastructure. However, challenges remain, including low productivity and demographic issues. Both countries celebrate their EU membership as a catalyst for progress, emphasizing their commitment to the European project.