Answer:
The 1920s was a decade of the Gregorian calendar that began on January 1, 1920, and ended on December 31, 1929. In North America, it is frequently referred to as the "Roaring Twenties" or the "Jazz Age", while in Europe the period is sometimes referred to as the "Golden Age Twenties" because of the economic boom following World War I. French speakers refer to the period as the "Années folles", emphasizing the era's social, artistic, and cultural dynamism.
Explanation:
Increasing the amount of well nourished workers for the factories during the industrial revolution
The first one, after the 4th crusade which saw the sacking of Constantinople by the crusaders who had been stranded there waiting for their payment from the emperor of the Byzantine empire, let's just say that the Byzantines weren't big fans of western Europe for a good while, but I could be wrong so wait for other answers :)
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