After signing the Anglo-Afghan Treaty of Rawalpindi on 8 August, Britain formally recognised the sovereignty and independence of Afghanistan. On 19 August 1919 Emir Amanullah Khan declared independence from British influence.
The national flag of Afghanistan features three vertical bands of black, red, and green colour. The black symbolises the troubled past of the country. The green represents both Islam and prosperity. The red represents the blood, shed by those who fought for the country's independence.