What is the reason for the internal melee in Afghanistan that has lasted for more than 40 years?

The reason is because Afghanistan’s geographical location is useful to many countries.

Afghanistan has been living in war since its independence. Why do wars and turmoil continue to occur? Because of the topography of Afghanistan, Afghanistan is between the Middle East and the Far East, so it is important to both the Middle East and the Far East. In the 18th century, Britain and Russia had been fighting fiercely. Russia had always believed that Afghanistan was the only way to go south to the Indian Ocean, while the British believed that Afghanistan was an important barrier for the United States. In this way, during the Cold War, the Soviet Union and the United States competed for hegemony and headed south. The Indian Ocean has waged a ten-year war of aggression against Afghanistan. Afghanistan's geographical location has always been an important location of concern to major powers.

Russia regards Afghanistan as the only way to prevent other major powers from entering Central Asia. From a geographical point of view, Afghanistan has a very bad terrain and very little water resources, which is not conducive to aircraft and mechanization. Where weapons fight. And Afghanistan has many limestone mountains with many natural caves, which can accommodate many people like a maze. These natural caves have small exits and relatively large interiors. It is easy to be ignored, especially in the grass and trees. It cannot be found at ordinary times, and it is a terrain that is easy to defend and difficult to attack. It is recorded in history that Britain has been famous in Afghanistan three times, but failed miserably and did not get any benefits. The Soviet Union also sent troops to attack Afghanistan, but the Afghan army relied on the favorable terrain to deal with the invaders. They would also kill the invaders when they had the opportunity. In this war, the Soviet casualties reached more than 30,000. ?

Afghanistan has always been at war, and many countries are trying to invade Afghanistan. However, due to the complex terrain of Afghanistan, many people stayed in Afghanistan without going out. The language and customs of these people are no different, but after a long period of isolation, they begin to become unfamiliar. After experiencing large-scale migration and war, wars between races, ethnic groups, and tribes formed in a relatively closed environment. ?