On 26 July 1947, Spain was declared a kingdom, but no monarch was designated until in 1969 Franco established Juan Carlos of Bourbon as his official heir-apparent. Franco was to be succeeded by Luis Carrero Blanco as Prime Minister with the intention of continuing the Francoist regime, but those hopes ended with his 1973 assassination by the Basque separatist group ETA. With the death of Franco on 20 November 1975, Juan Carlos became the King of Spain. He initiated the country's subsequent transition to democracy, ending with Spain becoming a constitutional monarchy with an elected parliament and autonomous devolved governments.