What was the primary reason for the economic recession in Europe following World War I?

The primary reason for the economic recession in Europe following World War I was due to the decline in the economic activities in the United States.

This was because the activities and plans achieved during the war had to undergo some modifications after the war which resulted in a certain degree of economic deterioration. Although it occurred for a short while after which economic boom occurred.

operation overlord was the codename for the battle of normandy, the allied operation that launched the successful invasion of german-occupied western europe during world war ii. the operation was launched on 6 june 1944 with the normandy landings