What was the global population post world war 1?

After World War I, which ended in 1918, the global population was estimated to be around 1.8 billion people. The war, along with the subsequent Spanish flu pandemic, had significant demographic impacts, leading to a notable loss of life and altering population dynamics in many regions. By the early 1920s, the population began to recover, although the effects of the war and the pandemic were still felt in various parts of the world.