FIDAC (The Interallied Federation of War Veterans Organisations), the first international organization of war veterans is established in Paris, France.

FIDAC was established in Paris in November 1920, at the initiative of the veterans from World War I predominant pacifists, such as Hubert Aubert, director in UNC , France, and in particular Charles Bertrand, Secretary-General of UNC and deputy in the French Parliament. They had the idea of uniting veterans’ associations established after the end of World War I in various allied countries into an international federation whose main purpose was to promote peace, continuously strengthen the brotherhood initiated on the battlefield, and provide help to the wounded, the disabled, widowers, war orphans, veterans, and also commemorate the heroes fallen in battles. Charles Bertrand, general secretary and future president of UNC in France, thus became the first president of FIDAC (1920–1924).

Paris is the capital and largest city of France. With an estimated population of 2,048,472 in January 2025 in an area of more than 105 km² (41 sq mi), Paris is the fourth-most populous city in the European Union and the 30th most densely populated city in the world in 2022. Since the 17th century, Paris has been one of the world's major centres of finance, diplomacy, commerce, culture, fashion, and gastronomy. Because of its leading role in the arts and sciences and its early adoption of extensive street lighting, Paris became known as the City of Light in the 19th century.

France, officially the French Republic, is a country primarily located in Western Europe. Its overseas regions and territories include French Guiana in South America, Saint Pierre and Miquelon in the North Atlantic, the French West Indies, and many islands in Oceania and the Indian Ocean, giving it one of the largest discontiguous exclusive economic zones in the world. Metropolitan France shares borders with Belgium and Luxembourg to the north; Germany to the northeast; Switzerland to the east; Italy and Monaco to the southeast; Andorra and Spain to the south; and a maritime border with the United Kingdom to the northwest. Its metropolitan area extends from the Rhine to the Atlantic Ocean and from the Mediterranean Sea to the English Channel and the North Sea. Its eighteen integral regions—five of which are overseas—span a combined area of 632,702 km² (244,288 sq mi) and have an estimated total population of over 68.6 million as of January 2025. France is a semi-presidential republic. Its capital, largest city and main cultural and economic centre is Paris.