The Treaty of Lausanne is signed by the Allies and Turkey, the successor state to the Ottoman Empire. It supersedes the failed Treaty of Sèvres and offically ends the First World War.

The Treaty of Sèvres is signed by the Allies and the Ottoman Empire. The treaty is not recognised by the Turkish national movement, which considers the Constantinople (now Istanbul) government illegitimate.

The Treaty of Trianon is signed by the Allies and newly-independent Hungary.

The first meeting of the League of Nations is held in London.

The Treaty of Neuilly-sur-Seine is signed by the Allies and Bulgaria.

The Treaty of Saint-Germain-en-Laye is signed by the Allies and newly-independent Austria.

The Treaty of Versailles is signed by the Allies and Germany.

At the Paris Peace Conference a proposal to create the League of Nations, an open diplomatic forum, is accepted.

A peace conference opens in Paris to negotiate treaties between the Allies and the defeated Central Powers. Many view the terms of the treaties as excessively punitive.