Black Lives Matter (BLM) is a decentralized political and social movement that seeks to highlight racism, discrimination, and racial inequality experienced by black people and to promote anti-racism. Its primary concerns are police brutality and racially motivated violence against black people. The movement began in response to the killings of Trayvon Martin, Michael Brown, Eric Garner, and Rekia Boyd, among others. BLM and its related organizations typically advocate for various policy changes related to black liberation and criminal justice reform. While there are specific organizations that label themselves "Black Lives Matter", such as the Black Lives Matter Global Network Foundation, the overall movement is a decentralized network with no formal hierarchy. As of 2021, there are about 40 chapters in the United States and Canada. The slogan "Black Lives Matter" itself has not been trademarked by any group.

The Ferguson unrest was a series of protests and riots which began in Ferguson, Missouri on August 10, 2014, the day after the fatal shooting of Michael Brown by FPD officer Darren Wilson. The unrest sparked a vigorous debate in the United States about the relationship between law enforcement officers and Black Americans, the militarization of police, and the use-of-force law in Missouri and nationwide. Continuing activism expanded the issues by including modern-day debtors prisons, for-profit policing, and school segregation.