The shooting of Trayvon Martin by George Zimmerman in 2012 sparked a movement that challenged, and challenges, US society to look at anti-black racism and state violence. Aided by social media, Black Lives Matter (BLM) is moving beyond borders and spreading across the world. It has also had a profound impact on the tone of the US Presidential election - a key moment of exposure being the disruption of Bernie Sander's campaign rally in Seattle.
The issues articulated by BLM are not new. They identify issues such as mass incarceration (2.8 million black people are locked up by the state), violence against black people (in 2015 about one in every 65 deaths of young African Americans was at the hand of the police), and 500,000 undocumented black immigrants as examples of Black people being systematically dehumanised by the state and society.