The correct answer to this open question is the following.
You forgot to attach the article or the author of the article.
However, doing some research we can say the following.
The central idea of the article Emmett Till is how the people got interested in Emmett Till. His murder rose national attention. This sad incident embarrassed many people in the southern states and convinced them to do something and fight to demand racial equality and justice. After his death, Emmett Till became a symbol of the racial injustice that lived in the United States. This issue inspired thousands of people to promote justice and equality for all citizens.