Bird's-eye View Of Afghanistan

Pull out your sword and slay any one, that says Pashtun and Afghan are not one! Arabs know this and so do Romans: Afghans are Pashtuns, Pashtuns are Afghans!
The last part of the name, -stān is a Persian suffix for "place", prominent in many languages of the region. The name "Afghanistan" is described by the 16th century Mughal Emperor Babur in his memoirs as well as by later Mughal scholar Firishta, both referring to the territories south of Kabul that were inhabited by Pashtuns (called "Afghans" by both authors). Until the 19th century the name was used for the traditional lands of the Pashtuns only, while the kingdom as a whole was known as the Kingdom of Kabul, as mentioned by the British statesman and historian Mountstuart Elphinstone. In 1857, in his review of J.W. Kaye's The Afghan War, Friedrich Engels describes "Afghanistan" as:
... an extensive country of Asia ... between Persia and the Indies, and in the other direction between the Hindu Kush and the Indian Ocean. It formerly included the Persian provinces of Khorassan and Kohistan, together with Herat, Beluchistan, Cashmere, and Sinde, and a considerable part of the Punjab ... Its principle cities are Kabul, the capital, Ghuznee, Peshawer, and Kandahar.
Other parts of the country were at certain periods recognized as independent kingdoms, such as the Kingdom of Balkh in the late 18th and early 19th centuries. With the expansion and centralization of the country, Afghan authorities adopted and extended the name "Afghanistan" to the entire kingdom, after its English translation had already appeared in various treaties between the British Raj and Qajarid Persia, referring to the lands subject to the Pashtun Barakzai dynasty of Kabul. It became the official internationally recognized name in 1919 after the Treaty of Rawalpindi was signed to regain full independence over its foreign policy from the British, and was confirmed as such in the nation's 1923 constitution.