Various rationalist architectural works, typically white or light-coloured, were built in the 1920s and 1930s, such as La Equitativa, Nautico, and Easo. In 1924–1926, canalisation work was carried out on the Urumea river at the southern edge of the city. However, after the city's Belle Epoque in the European wartime, repression under Miguel Primo de Rivera's dictatorship was not favourable for the city. In 1924, gambling was prohibited by the authoritarian regime, causing existential problems for the Grand Casino and the Kursaal (1921).