The best inference from the author's statement that World War II "ended the Great Depression" as it increase production needed to support the war effort created additional jobs for those who were unemployed.
The depression ended as industries began to produce materials and weapons for the soldiers fighting in the WWII in Europe.
Guns and other weapons were mass produced for the US troops.
Unemployed youngsters joined as troops while other worked in industries.
The availability of jobs in different fields and sectors created opportunities for people to earn a living which was not possible in the 1920s.
Therefore we can conclude that the Great Depression ended with the WWII in America.
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