sentences:  During the first 25 years of the "autonomic" period, the region accounted for the biggest economic growth in Spain, becoming a platform for the internationalisation of the Spanish economy, featuring a marked preponderance of the service sector.By the turn of the 21st century, a strong boost to the construction sub-sector also took place.During this period the region stood out due to its role as centre for welcoming immigration, due to its condition as transport node vis-à-vis the Spanish geography, and due to its condition as scientific and cultural centre of the country.