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League of Nations Society in Canada, founded 1921 to promote international peace by developing public knowledge of and support for the LEAGUE OF NATIONS. With headquarters in Ottawa, it operated until 1942.

The Women's International League for Peace and Freedom was founded 1915 in The Hague, the Netherlands, by women active in the Women's Suffrage movement in Europe and North America. These women wished to end WWI and seek ways to ensure that no more wars took place.

The World Trade Organization (WTO) is the only international organization that regulates global trade. It is based in Geneva, Switzerland. Canada is one of its 164 members. The country plays a central role in the WTO and was also a key member of the General Agreement on Tariffs and Trade that preceded it. In addition to helping craft the WTO’s dispute resolution systems, Canada is among those countries most directly involved in its trade dispute cases.

The United Nations (UN) is an international organization made up of 193 member states. The UN works to maintain global peace and security, address humanitarian concerns, promote cultural heritage, and administer systems of international law, transportation, commerce and justice. Canada is a founding member of the UN (see Canada and the League of Nations). 

The International Boundary Commission (IBC), comprising a Canadian and an American section, is responsible for the maintenance and supervision of the boundary line between the United States and Canada under the terms of the 1925 Boundary Demarcation Treaty.

The United Nations Conference on Trade and Development (UNCTAD) was established in 1964 as a permanent organ of the UN General Assembly to promote international trade, with an emphasis on speeding the economic development of developing nations.

Genocide is the intentional destruction of a particular group through killing, serious physical or mental harm, preventing births and/or forcibly transferring children to another group. The Canadian government has formally recognized five instances of genocide abroad: the Armenian genocide, the Holodomor, the Holocaust, the Rwandan genocide and the ethnic cleansing in Bosnia. Within Canada, some historians, legal scholars and activists have claimed that the historical, intergenerational and present treatment of Indigenous peoples are acts of genocide.

The League of Nations was an organization of 63 countries established in 1919, after the First World War. Canada was a founding member. The League ultimately failed in its aim of collective security. It was replaced by the United Nations at the end of the Second World War. However, the League of Nations did establish a new model for international organizations. League membership brought Canada its first official contact with foreign governments and helped to establish its position as a sovereign state. It also introduced Canada to the opportunities and challenges of international co-operation and peacekeeping.

The North Atlantic Treaty Organization (NATO) was created on 4 April 1949. It was Canada’s first peacetime military alliance. It placed the country in a defensive security arrangement with the United States, Britain, and Western Europe. (The other nine founding nations were France, Norway, Denmark, Belgium, Netherlands, Luxembourg, Portugal, and Italy.) During the Cold War, NATO forces provided a frontline deterrence against the Soviet Union and its satellite states. More recently, the organization has pursued global peace and security while asserting its members’ strategic interests in the campaign against Islamic terrorism. As of 2021, there were 30 member countries in NATO.