The Treaty of Windsor was negotiated by King John I of Portugal and John of Gaunt, the Duke of Lancaster, on behalf of the English king Richard II and remains in force. This makes it the longest-lasting diplomatic treaty in recorded history, and even served as the basis for Portuguese assistance to Britain during the Second World War.

The Jay Treaty, named after John Jay, the chief negotiator on behalf of the United States, sought to resolve several key disputes in the aftermath of the American Revolutionary War and the subsequent Treaty of Paris in 1783.

The agreement marked the end of years of intermittent conflict between Britain and France and set the stage for the series of agreements known as the Triple Entente that bound Britain, France and Russia together at the start of the First World 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.