How did we get here from Ferguson?

Michael Brown and Darren Wilson encountered one another as Brown walked with a friend, Dorian Johnson, down the middle of Canfield Drive after 12 p.m. on Saturday, August 9, 2014. Wilson told authorities he approached the two young men because they were blocking traffic.

What happened next depends on whom you ask.

Authorities said that Brown attacked Wilson in his car and tried to take his gun. Others said Wilson was the aggressor, and that Brown had his hands up when Wilson began firing.

What is clear is that Wilson shot and killed Brown, who was unarmed. According to the St. Louis Post-Dispatch, the entire fatal encounter took less than two minutes.

Crowds quickly gathered at the scene of the shooting as Brown's body remained in the street for four hours.

Two days after Brown's killing, authorities estimated as many as 1,000 demonstrators were protesting in Ferguson. "We had what probably bordered on riot conditions," Ferguson Police Chief Thomas Jackson said, explaining that it took hours to process the scene, collect evidence and move Brown's body.

The frustration and anger in the community became crystal clear in the weeks that followed as residents faced off with police, with some of the demonstrations turning violent.

The outcry heard in Ferguson was already building before Brown was killed. The month before, another high-profile case revolved around Eric Garner, an unarmed African-American man who died in New York after being placed in a chokehold by police.

Two years before that, it was 17-year-old Trayvon Martin, who was also unarmed when he was shot and killed by neighborhood watch volunteer George Zimmerman. The rallying cry of "Black Lives Matter" was formed when Zimmerman was found not guilty of murder in Martin's death, and it transformed into a movement in the wake of Ferguson.

The death of Brown, who'd just graduated from high school and was two days away from starting college, was seen by many as another example of mistreatment by police in African-American communities. And Ferguson already had a long history of distrust between its mostly white police force and the city's mainly black population.

Between August 9 and August 25, 2014, the hashtag #Ferguson was used on Twitter 11.6 million times with retweets and 1.9 million times without, according to the social media monitoring company, Sysomos.

What happened in Ferguson, many on social media were saying, was happening everywhere.

One was a criminal investigation led by St. Louis County, which determined whether Wilson would face charges. The other was a civil rights investigation spearheaded by federal officials.

The feds also led a civil rights investigation into the Ferguson police department's overall track record with minorities.

The grand jury's decision not to indict Wilson in November 2014 was met with chaos. While most protesters that night were peaceful, some businesses throughout the city were also looted or set on fire.

Police responded by deploying tear gas, as the governor called in the Missouri National Guard.

Protests against the grand jury's decision spread across the country, including in New York, Chicago and in front of the White House in Washington, D.C.

The former officer told The New Yorker in 2015 that he's since been living in seclusion with his wife and daughter.

The DOJ announced it would not bring any federal charges against Wilson, and it also reported systemic racial discrimination by Ferguson police and its court system.

In swift succession, Ferguson officials -- including the city's police chief and city manager at the time -- resigned.

With new officials in place, you might think the tension in Ferguson would start to dissolve. Not so. A year after the Justice Department reported a "pattern and practice" of discrimination in Ferguson's criminal justice system, the DOJ sued the city to try and push police reform.

By March 2016, Ferguson and the U.S. Justice Department reached an agreement to overhaul the Missouri city's troubled police force and municipal court system.

"This agreement marks the beginning of a process that the citizens of Ferguson have long awaited -- the process of ensuring that they receive the rights and protections guaranteed to every American under the law," said Attorney General Loretta Lynch.

From Tamir Rice in Cleveland, to Walter Scott in South Carolina, to Laquan McDonald in Chicago, to Alton Sterling in Baton Rouge and Philando Castile in Minnesota, the growing list of black men and boys killed in police confrontations has prompted protests around the globe.