A US soldier relaxing at base in Cambodia during the Vietnam War in June of 1970.
Like the situation in Afghanistan and Pakistan, many North Vietnamese fighters took refuge in Cambodia due to the country’s tolerance of their presence. Between 1965-1970 US troops heavily bombed Cambodia in secret to try to rid the fighters.
Due in large part to US involvement in destabilizing Cambodia, the Khmer Rouge government eventually took power under Pol Pot.
Under his rule Cambodia saw a genocide in which ~ 2 million, nearly 25% of the country’s population, would die in four years.