Why is the west so dominant in controlling the world? What would happen if they left? Would terrorists and anarchists grow out of control?

The western world has always tried to maintain peace. For example when Hitler was conquering the world, the USA stepped in and helped to stop him. What would happen if the west just stepped back from the beginning? Hitler would have succeeded? How crazy would this place be?
Why is the west so dominant in controlling the world? What would happen if they left? Would terrorists and anarchists grow out of control?
Why is the west so dominant in controlling the world? What would happen if they left? Would terrorists and anarchists grow out of control?
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