What was the single most important factor behind the prosperity of the 20’s

united states reinforcements contributed greatly to three allied victories in france at: cantigny (first major american battle), argonne (the largest in the united states military history, involving 1.2 million american soldiers), and château-thierry (one of the first actions under general pershing).

your answer would be just capitalism.

number   5 i know this because savannah was the first capital and i took the test and all you have to do is look up a map of georgia savannah.

during the 1920s the goal of the united states was not letting business collide or go down or even compete this was due to wwl