集中と統一
The Democratic Union of Catalonia (; , UDC), frequently shortened as Union (; ), was a regionalist, Christian-democratic political party in the Catalonia region of Spain existing between 1931 and 2017. Together with Democratic Convergence of Catalonia (CDC), they formed the Convergence and Union (CiU) alliance and federation from 1978 until its dissolution in 2015, under which they would rule the government of Catalonia for almost three decades during the recent Spanish democratic period.