The protests in Ferguson, Mo., are just the most recent in a decades-long history of civil unrest following violence against African Americans. Here we look at notable cases which spurred a nationwide outcry.
Above, police stand watch as demonstrators protest the fatal shooting of an unarmed black teenager, Michael Brown. Police said Brown reached for an officer's gun in a police car. A witness in the case said Brown had raised his arms to show that he was unarmed before being killed.
In April of 1992, after a jury acquitted four police officers involved in the beating of Rodney King, riots broke out throughout South Central Los Angeles, killing 55 people, injuring another 2,000, and causing more than $1 billion in damage.
Above, a member of the National Guard stands near a burning building during the riots.
Rodney King (right) delivered an emotional appeal calling for an end of the rampant violence that gripped Los Angeles.
In 1989, three days of race riots began in Overtown, Miami, when a black man fleeing on a motorcycle was killed by a Hispanic police officer. During the riots, 125 blocks were sealed off.
In 2009, Bay Area Rapid Transit (BART) officer Johannes Mehserle shot and killed Oscar Grant, an unarmed black man, which triggered riots in Oakland.
Above, in July 2010, demonstrators in Oakland protested the verdict in Mehserle's trial. He was found guilty of involuntary manslaughter and not guilty of second-degree murder and voluntary manslaughter.
Trayvon Martin, who was carrying only a bag of Skittles and iced tea, was shot in 2012 after an altercation with neighborhood watch volunteer George Zimmerman, who pursued Martin on foot after being told not to by 911 dispatchers.
A day after Zimmerman was found not guilty on all charges, protests were held around the United States. Above, a student-organized march at Washington Park in Chicago.
Chicago native Emmett Till, 14, was murdered in 1955 by two white men in Mississippi after he allegedly flirted with the wife of one of the men.
Above, Till's mother, Mamie E. Bradley (left), appears at the trial of Roy Bryant and J. W. Milam, who were charged with Till's murder. Bryant and Milam were acquitted though they later admitted to committing the crime.
Till's mother insisted on a glass-topped casket to show how her son had been brutalized. The murder caused national outrage and helped fuel the civil rights movement. Till's family recently donated the casket to the Smithsonian's National Museum of African American History and Culture.