The idea to engage Alliance Parliamentarians in collective deliberations on the problems confronting the transatlantic partnership first emerged in the early 1950s and took shape with the creation of an annual conference of NATO parliamentarians in 1955. The Assembly's creation reflected a desire on the part of legislators to give substance to the premise of the Washington Treaty of 1949 (also known as the North Atlantic Treaty) that NATO was the practical expression of a fundamentally political transatlantic alliance of democracies.