Frederik IX of Denmark

Frederik IX became King of Denmark on April 20, 1947, following the death of his father, Christian X. His reign oversaw the post-war reconstruction and modernization of Denmark.

Frederik IX supported Denmark's accession to NATO in 1949, aligning the country with Western powers during the Cold War. This marked a shift from Denmark's traditional neutrality.

Frederik IX signed a new constitution in 1953 that abolished the upper house (Landsting), introduced a unicameral parliament (Folketing), and allowed female succession to the throne. This modernized the Danish political system.

During Frederik IX's reign, Denmark expanded its welfare state, including the introduction of universal healthcare, old-age pensions, and social security. These reforms were part of the post-war social democratic consensus.

Frederik IX died on January 14, 1972, and was succeeded by his daughter, Margrethe II, who became Denmark's first reigning queen in centuries. His death marked the end of an era of post-war reconstruction.