Isolation almost invariably means poverty and backwardness. You’re not aware of how the basic things of life are done differently in other parts of the world, and so people who are isolated will keep doing things the same way for centuries or thousands of years. For example, when the British landed in Australia, they found the Australian aborigines living at a Stone Age level. The aborigines had no idea of iron. Australia is one of the great sources of iron ore in the world.
Thomas Sowell discusses retrogressive culture, the importance of geography, and leftism versus success: