27th August 1928: Fifteen nations including Germany, France and the United States sign the Kellogg-Briand Pact to renounce war

At the time it was optimistically hoped that the signing of the Kellogg-Briand Pact would stop any future wars, but the impact of the Great Depression in the 1930s led nations such as Japan and Italy to launch invasions of Manchuria and Abyssinia respectively.