World History
The world's first drainage system was build by the people of

Chinese civilization
Mesopotamian civilization
Egyptian civilization
Indus Valley civilization

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World History
The Great Depression in the 1930s refers to

An economic hollowing out leading to widespread unemployment and collapse of stock values
A tropical storm that raged for weeks
An ailment afflicting millions overhung to a new vector borne disease
A prolonged seasonal influence of unpredictable weather owing to earthquakes and tsunamis

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