The League of Nations (LN or LoN; , SdN) was the first worldwide intergovernmental organisation whose principal mission was to maintain world peace. It was founded on 10 January 1920 by the Paris Peace Conference that ended the First World War. The main organisation ceased operations on 18 April 1946 when many of its components were relocated into the new United Nations (UN) which was created in the aftermath of the Second World War. The League of Nations was the precursor organisation to the United Nations.

The League's primary goals were stated in its eponymous Covenant. They included preventing wars through collective security and disarmament and settling international disputes through negotiation and arbitration. Its other concerns included labour conditions, just treatment of native inhabitants, human and drug trafficking, the arms trade, global health, prisoners of war, and protection of minorities in Europe.See Article 23, , and Minority Treaties. The Covenant of the League of Nations was signed on 28 June 1919 as Part I of the Treaty of Versailles, and it became effective with the rest of the Treaty on 10 January 1920. Australia was granted the right to participate as an autonomous member nation, marking the start of Australian independence on the global stage. The first meeting of the Council of the League took place on 16 January 1920, and the first meeting of the Assembly of the League took place on 15 November 1920. In 1919, U.S. president Woodrow Wilson won the Nobel Peace Prize for his role as the leading architect of the League. Despite this, he was ultimately unsuccessful in getting his country to join it.

The diplomatic philosophy behind the League represented a fundamental shift from the preceding hundred years. The League lacked its own armed force and depended on the victorious Allied Powers of World War I (Britain, France, Italy and Japan were the initial permanent members of the Council) to enforce its resolutions, keep to its economic sanctions, or provide an army when needed. The great powers were often reluctant to do so. Sanctions could hurt League members, so they were reluctant to comply with them. During the Second Italo-Ethiopian War, when the League accused Italian soldiers of targeting International Red Cross and Red Crescent Movement medical tents, Benito Mussolini responded that "the League is very well when sparrows shout, but no good at all when eagles fall out."

At its greatest extent from 28 September 1934 to 23 February 1935, it had 58 members. After some notable successes and some early failures in the 1920s, the League ultimately proved incapable of preventing aggression by the Axis powers in the 1930s. Its credibility was weakened because the United States never joined. Japan and Germany left in 1933, Italy left in 1937, and Spain left in 1939. The Soviet Union only joined in 1934 and was expelled in 1939 after invading Finland, but not after invading Poland earlier [17 September 1939- see Ribbentrop-Molotov Pact] Furthermore, the League demonstrated an irresolute approach to sanction enforcement for fear it might only spark further conflict, further decreasing its credibility. The onset of the Second World War in 1939 showed that the League had failed its primary purpose: to prevent another world war. It was largely inactive until its abolition. The League lasted for 26 years; the United Nations effectively replaced it in 1945, inheriting several agencies and organisations founded by the League, with the League itself formally dissolving the following year.

Current scholarly consensus views that, even though the League failed to achieve its main goal of world peace, it did manage to build new roads towards expanding the rule of law across the globe; strengthened the concept of collective security, gave a voice to smaller nations; fostered economic stabilisation and financial stability, especially in Central Europe in the 1920s; helped to raise awareness of problems such as epidemics, slavery, child labour, colonial tyranny, refugee crises and general working conditions through its numerous commissions and committees; and paved the way for new forms of statehood, as the mandate system put the colonial powers under international observation.

Origins Background

The concept of a peaceful community of nations had been proposed as early as 1795, when Immanuel Kant's Perpetual Peace: A Philosophical Sketch outlined the idea of a league of nations to control conflict and promote peace between states. Kant argued for the establishment of a peaceful world community, not in a sense of a global government, but in the hope that each state would declare itself a free state that respects its citizens and welcomes foreign visitors as fellow rational beings, thus promoting peaceful society worldwide. International co-operation to promote collective security originated in the Concert of Europe that developed after the Napoleonic Wars in the 19th century in an attempt to maintain the status quo between European states and so avoid war.

By 1910, international law developed with the first Geneva Conventions establishing laws dealing with humanitarian relief during wartime, and the international Hague Conventions of 1899 and 1907 governing rules of war and the peaceful settlement of international disputes. Theodore Roosevelt at the acceptance for his Nobel Prize in 1910, said: "it would be a masterstroke if those great powers honestly bent on peace would form a League of Peace."

One small forerunner of the League of Nations, the Inter-Parliamentary Union (IPU), was formed by the peace activists William Randal Cremer and Frédéric Passy in 1889 (and still exists as an international body focused on the world's various elected legislative bodies). The IPU was founded with an international scope, with a third of the members of parliaments (in the 24 countries that had parliaments) serving as members of the IPU by 1914. Its foundational aims were to encourage governments to solve international disputes by peaceful means. Annual conferences were established to help governments refine the process of international arbitration. Its structure was designed as a council headed by a president, which would later be reflected in the structure of the League.

Plans and proposals

At the start of the First World War, the first schemes for an international organisation to prevent future wars began to gain considerable public support, particularly in the United Kingdom and the United States. Goldsworthy Lowes Dickinson, a British political scientist, coined the term "League of Nations" in 1914 and drafted a scheme for its organisation. Together with Lord Bryce, he played a leading role in the founding of the group of internationalist pacifists known as the Bryce Group, later the League of Nations Union. The group became steadily more influential among the public and as a pressure group within the then-governing Liberal Party. In Dickinson's 1915 pamphlet After the War he wrote of his "League of Peace" as being essentially an organisation for arbitration and conciliation. He felt that the secret diplomacy of the early twentieth century had brought about war, and thus, could write that, "the impossibility of war, I believe, would be increased in proportion as the issues of foreign policy should be known to and controlled by public opinion." The 'Proposals' of the Bryce Group were circulated widely, both in England and the US, where they had a profound influence on the nascent international movement. In January 1915, a peace conference directed by Jane Addams was held in the neutral United States. The delegates adopted a platform calling for creation of international bodies with administrative and legislative powers to develop a "permanent league of neutral nations" to work for peace and disarmament. Within months, a call was made for an international women's conference to be held in The Hague. Coordinated by Mia Boissevain, Aletta Jacobs and Rosa Manus, the congress, which opened on 28 April 1915 was attended by 1,136 participants from neutral nations, and resulted in the establishment of an organisation which would become the Women's International League for Peace and Freedom (WILPF). At the close of the conference, two delegations of women were dispatched to meet European heads of state over the next several months. They secured agreement from reluctant foreign ministers, who overall felt that such a body would be ineffective, but agreed to participate in or not impede creation of a neutral mediating body, if other nations agreed and if President Woodrow Wilson would initiate a body. In the midst of the War, Wilson refused.

In 1915, a body similar to the Bryce Group was set up in the United States, led by former president William Howard Taft. It was called the League to Enforce Peace. It advocated the use of arbitration in conflict resolution and the imposition of sanctions on aggressive countries. None of these early organisations envisioned a continuously functioning body; with the exception of the Fabian Society in England, they maintained a legalistic approach that would limit the international body to a court of justice. The Fabians were the first to argue for a "council" of states, necessarily the great powers, who would adjudicate world affairs, and for the creation of a permanent secretariat to enhance international co-operation across a range of activities.

In the course of the diplomatic efforts surrounding World War I, both sides had to clarify their long-term war aims. By 1916 in Britain, fighting on the side of the Allies, and in the neutral United States, long-range thinkers had begun to design a unified international organisation to prevent future wars. Historian Peter Yearwood argues that when the new coalition government of David Lloyd George took power in December 1916, there was widespread discussion among intellectuals and diplomats of the desirability of establishing such an organisation. When Lloyd George was challenged by Wilson to state his position with an eye on the postwar situation, he endorsed such an organisation. Wilson himself included in his Fourteen Points in January 1918 a "league of nations to ensure peace and justice." British foreign secretary, Arthur Balfour, argued that, as a condition of durable peace, "behind international law, and behind all treaty arrangements for preventing or limiting hostilities, some form of international sanction should be devised which would give pause to the hardiest aggressor."

The war had had a profound impact, affecting the social, political and economic systems of Europe and inflicting psychological and physical damage. Several empires collapsed: first the Russian Empire in February 1917, followed by the German Empire, Austro-Hungarian Empire and Ottoman Empire. Anti-war sentiment rose across the world; the First World War was described as "the war to end all wars", and its possible causes were vigorously investigated. The causes identified included arms races, alliances, militaristic nationalism, secret diplomacy, and the freedom of sovereign states to enter into war for their own benefit. One proposed remedy was the creation of an international organisation whose aim was to prevent future war through disarmament, open diplomacy, international co-operation, restrictions on the right to wage war, and penalties that made war unattractive.