Final answer:
Violence from population changes and racial tensions in America includes incidents such as the Red Summer of 1919 and the Tulsa Race Massacre, with conflicts often erupting in economically deteriorated and racially segregated areas in Northern cities after major wars.
Step-by-step explanation:
The violence that resulted from population changes and racial tensions can be traced back through several explosive events in American history. After World War I, during a period known as the Red Summer of 1919, severe racial conflicts occurred, including the Tulsa Race Massacre. Black Americans who moved North during the Great Migration faced hostility and competition for jobs and housing, which boiled over into race riots in cities like Chicago. In the South, lynchings and other forms of violence were used to suppress African American progress during Reconstruction.
The process repeated post-World War II with African American migration to Northern cities, leading to 'white flight' and eventually, urban violence in economically deteriorated and racially segregated areas. Notable incidents include violence in Detroit, violence in Harlem, and the draft riots that occurred in New York City. These events, deeply rooted in racial tensions, had a profound impact on the social and political fabric of the nation, sowing seeds for the Civil Rights Movement.