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20th century

Until the Monégasque Revolution of 1910 forced the adoption of the 1911 Constitution of Monaco, the princes of Monaco were absolute rulers. The new constitution slightly reduced the autocratic rule of the Grimaldi family and Prince Albert I soon suspended it during the First World War.

In July 1918, a new Franco-Monégasque Treaty was signed, providing for limited French protection over Monaco. The treaty, endorsed in 1919 by the Treaty of Versailles, established that Monégasque international policy would be aligned with French political, military and economic interests. It also resolved the Monaco succession crisis.

In 1943, the Italian Army invaded and occupied Monaco, forming a fascist administration. In September 1943, after Mussolini's fall from power, the German Wehrmacht occupied Italy and Monaco, and the Nazi deportation of the Jewish population began. René Blum, the prominent French Jew who founded the Ballet de l'Opéra in Monte Carlo, was arrested in his Paris home and held in the Drancy deportation camp outside the French capital before being transported to Auschwitz, where he was later murdered. Blum's colleague Raoul Gunsbourg, the director of the Opéra de Monte-Carlo, helped by the French Resistance, escaped arrest and fled to Switzerland. In August 1944, the Germans executed René Borghini, Joseph-Henri Lajoux and Esther Poggio, who were Resistance leaders.

Rainier III, succeeded to the throne on the death of his grandfather, Prince Louis II, in 1949, and then ruled until 2005. On 19 April 1956, Prince Rainier married the American actress Grace Kelly, an event that was widely televised and covered in the popular press, focusing the world's attention on the tiny principality.

A 1962 amendment to the constitution abolished capital punishment, provided for women's suffrage and established a Supreme Court of Monaco to guarantee fundamental liberties. In 1963, a crisis developed when Charles de Gaulle blockaded Monaco, angered by its status as a tax haven for wealthy French citizens.

In 1993, the Principality of Monaco became a member of the United Nations, with full voting rights.