1921-22 refers to the specific time period when the Washington Naval Conference took place. It started in November 1921 and ended in February 1922.
Related terms
World War I: A global conflict that lasted from 1914 to 1918 and involved many nations around the world.
Post-war Era: The period following World War I characterized by efforts to rebuild nations, negotiate peace treaties, and establish new systems of international relations.
Interwar Period: The time between World War I and World War II when economic depression, political tensions, and unresolved conflicts created an unstable global climate.