War, Peace, and Everything In Between: A Visual History of the United Nations in Posters
The United Nations was officially formed October 24,1945 after years of diplomatic debate and military involvement among its members. The idea of a formed allegiance of nations was originally introduced at the end of the first World War, through the Treaty of Versailles “to promote international cooperation and to achieve peace and security.” This newly formed League of Nations sought to help rebuild Europe in the aftermath of a crippling war, while opening the lines of diplomatic conversation to prevent further issues. Unfortunately, The League of Nations failed to prevent the series of events that led to the Second World War, and the committee was thus dissolved.

An LA Shaffer poster from WWI depicts American naval involvement. The USA wasn’t involved until the end of the war, and were not a member of the League of Nations that was formed by the Treaty of Versailles.
The United Nations formed its General Assembly in 1946, and has been meeting ever since. The meetings occur at the United Nations Headquarters in midtown Manhattan.