Which issue deteriorated race relations in 1919?

red summer
plessy v. ferguson
john brown’s raid
watts riots

On July 27, 1919, an African-American teenager drowned in Lake Michigan after violating the unofficial segregation of Chicago’s beaches and being stoned by a group of white youths. His death, and the police’s refusal to arrest the white man whom eyewitnesses identified as causing it, sparked a week of rioting between gangs of black and white Chicagoans, concentrated on the South Side neighborhood surrounding the stockyards. When the riots ended on August 3, 15 whites and 23 blacks had been killed and more than 500 people injured; an additional 1,000 black families had lost their homes when they were torched by rioters.