Why is the Red Summer of 1919 significant/important?

The ink had barely dried on the Treaty of Versailles, which formally ended World War I, when recently returned black veterans grabbed their guns and stationed themselves on rooftops in black neighborhoods in Washington D.C., prepared to act as snipers in the case of mob violence in July of 1919. Others set up blockades around Howard University, a black intellectual hub, creating a protective ring around residents.

Explanation:

answer; i believe its (cpr);