Afghanistan has two Independence Days. One from Britain and one from the USSR. The 19th of August is Independence from Britain Day, commemorating the Treaty of Rawalpindi in 1919. It is odd that Britain never really conquered Afghanistan, yet they memorialize this day. Afghanistan is one of the few countries on the planet that withstood the might of the three British Empire campaigns without being conquered.
The Afghan people have always highlighted that their country will never be conquered by any invading force.