Afghanistan officially the Islamic Republic of Afghanistan, is a landlocked country forming part of South Asia, Central Asia, and to some extent Western Asia. With a population of about 30 million, it has an area of 647,500 km (250,001 sq mi), making it the 42nd most populous and 41st largest nation in the world. It is bordered by Pakistan in the south and the east, Iran in the west, Turkmenistan, Uzbekistan and Tajikistan in the north, and China in the far northeast.
Afghanistan has been an ancient focal point of the Silk Road and human migration. Archaeologists have found evidence of human habitation from as far back as the Middle Paleolithic. Urban civilization may have begun in the area as early as 3,000 to 2,000 BC. Sitting at an important geostrategic location that connects the Middle East culture with Central Asia and the Indian subcontinent, the land has been home to various peoples through the ages and witnessed many military campaigns, notably by Alexander the Great, Genghis Khan, and in modern era Western forces. The land also served as a source from which the Greco-Bactrians, Kushans, Saffarids, Ghaznavids, Ghorids, Timurids, Mughals and many others have risen to form major empires.
The political history of the modern state of Afghanistan begins in 1709, when the Hotaki dynasty was established in Kandahar followed by Ahmad Shah Durrani's rise to power in 1747. In the late 19th century, Afghanistan became a buffer state in the "Great Game" between the British and Russian empires. Following the Third Anglo-Afghan War of 1919 and the signing of the Treaty of Rawalpindi, King Amanullah started modernization of the country. During the Cold War, after the withdrawal of the British from neighboring India in 1947, the United States and the Soviet Union began spreading their influences in Afghanistan. Between 1979 and 1989, the country experienced a major war between the US-backed mujahideen forces and the Soviet-backed Afghan government in which