Authorities in Cleveland are calling for calm after a grand jury there decided not to indict a white police officer for the 2014 shooting death of 12-year-old Tamir Rice, an African-American boy who was carrying a pellet gun.
Officials expect protests today, demonstrations similar to ones held throughout the country this past year by protesters with Black Lives Matter.
That movement got its start two years ago in Los Angeles, but 2015 has been the year that Black Lives Matter dominated the news.
Take Two looks at how it has shaped political and cultural conversations across America with Ange-Marie Hancock, an associate professor of political science at USC and author of "Solidarity Politics for Millennials."