Final answer:
The Red Summer of 1919 was a series of riots that occurred due to postwar racial tension in major US cities.
Step-by-step explanation:
The Red Summer of 1919 refers to a series of riots that broke out during the summer of 1919 due to postwar racial tension. These riots primarily occurred in major cities across the United States, such as Chicago, Washington D.C., and Tulsa. They were often ignited by incidents of police brutality or racial discrimination and resulted in violence, destruction of property, and loss of lives.
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