War, insurgency, IS and instability: Iraq since the 2003 US invasion

Smoke billows from an explosion at Saddam Hussein's presidential palace in Baghdad during a coalition air raid in April 2003. Photograph: Karim Sahib/EPA

Twenty years ago US-led forces invaded Iraq to oust Saddam Hussein. The Iraqi military was crushed and Saddam was chased from power in a span of weeks, but the consequences of the US action have reverberated domestically and in geopolitics to this day.