Between 1793 and 1814 Monaco was occupied by the French (in this period much of Europe had been overrun by French under command of Napoleon). The principality was reestablished in 1814 only to be designated a protectorate of the Kingdom of Sardinia by the Congress of Vienna in 1815. Monaco remained in this position until 1860 when, by the Treaty of Turin, the Sardinian forces pulled out of the principality and the surrounding county of Nice (as well as Savoy) was ceded to France. Monaco became a French protectorate once again. Before this time there was unrest in Menton and Roquebrune, where the townspeople had become weary of heavy taxation by the Grimaldi family. They declared their independence, hoping for annexation by Sardinia. France protested. The unrest continued until Charles III gave up his claim to the two mainland towns (some 95% of the principality at the time) that had been ruled by the Grimaldi family for over 500 years. These were ceded to France in return for 4,100,000 francs. The transfer and Monaco's sovereignty were recognized by the Franco-Monegasque Treaty of 1861.
In 1869, the principality stopped collecting income tax from its residents—an indulgence the Grimaldi family could afford to entertain thanks solely to the extraordinary success of the casino. This made Monaco not only a playground for the rich, but a favored place for them to live.
Until the Monegasque Revolution of 1910 forced the adoption of the 1911 constitution, the princes of Monaco were absolute rulers. The new constitution, however, barely reduced the autocratic rule of the Grimaldi family and Prince Albert I soon suspended it during the First World War. In July 1918, the Franco-Monegasque Treaty was signed, providing for limited French protection over Monaco. The treaty, endorsed in 1919 by the Treaty of Versailles, established that Monegasque international policy would be aligned with French political, military, and economic interests, and resolved the Monaco Succession Crisis. In 1943, the Italian Army invaded and occupied Monaco, forming a fascist administration. Shortly thereafter, following the collapse of Mussolini, the German Wehrmacht occupied Monaco and the Nazi deportation of the Jewish population began. René Blum, the prominent French Jew who founded the Ballet de l'Opera in Monte Carlo, was arrested in his Paris home and held in the Drancy deportation camp outside the French capital before being transported to the Auschwitz concentration camp, where he was later killed. 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, who ruled until 2005, succeeded to the throne following the death of his grandfather, Prince Louis II, in 1949. On 19 April 1956, Prince Rainier married the American actress Grace Kelly; the event 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.
The 2014 film Grace of Monaco is loosely based on this crisis. In 1993, the Principality of Monaco became a member of the United Nations, with full voting rights. 21st century In 2002, a new treaty between France and Monaco specified that, should there be no heirs to carry on the Grimaldi dynasty, the principality would still remain an independent nation rather than revert to France. Monaco's military defence, however, is still the responsibility of France. On 31 March 2005, Rainier III, who was too ill to exercise his duties, relinquished them to his only son and heir, Albert. He died six days later, after a reign of 56 years, with his son succeeding him as Albert II, Sovereign Prince of Monaco.
Following a period of official mourning, Prince Albert II formally assumed the princely crown on 12 July 2005, in a celebration that began with a solemn Mass at Saint Nicholas Cathedral, where his father had been buried three months earlier. His accession to the Monégasque throne was a two-step event with a further ceremony, drawing heads of state for an elaborate reception, held on 18 November 2005, at the historic Prince's Palace in Monaco-Ville. On 27 August 2015, Albert II apologised for Monaco's role during World War II in facilitating the deportation of a total of 90 Jews and resistance fighters, of whom only nine survived. "We committed the irreparable in handing over to the neighbouring authorities women, men and a child who had taken refuge with us to escape the persecutions they had suffered in France," Albert said at a ceremony in which a monument to the victims was unveiled at the Monaco cemetery.
"In distress, they came specifically to take shelter with us, thinking they would find neutrality." In 2015, Monaco unanimously approved a modest land reclamation expansion intended primarily for some desperately needed housing and a small green/park area. Monaco had previously considered an expansion in 2008, but called it off. The plan is for about six hectares of apartment buildings, parks, shops and offices for about 1 billion euros for the land. The development will be adjacent to the Larvotto district and also will include a small marina. There were four main proposals, and the final mix of use will be finalised as the development progresses. The name for the new district is Anse du Portier.