Authors often use their own personal experiences to inform their story lines and develop their characters. the fact that arthur conan doyle uses this technique is made most evident through

the star of david was known as the jewish star : d

major league baseball

explanation:

jack roosevelt robinson broke the color barrier in major league baseball.as he was the first african american to play in the major leagues, jackie robinson became the target of racial abuse. jackie robinson is referring to the historic event, harlem riot.