Since the beginning of the 20th century, mankind has experienced two calamitous world wars.World War I took place between 1914 and 1918, involving 30 countries and a population of 1.3 billion, or 75...
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Since the beginning of the 20th century, mankind has experienced two calamitous world wars.World War I took place between 1914 and 1918, involving 30 countries and a population of 1.3 billion, or 75...