Conrad's Heart of Darkness is a critique of imperialism in Africa under King Leopold II of Belgium. While some imperialism aimed to be efficient, Leopold's rule was inefficient and exploited the Congo for ivory and rubber through forced labor, with little development. Marlow sees the decaying infrastructure of the Belgian regime and an inadequate currency system. Though some initially viewed imperialism as civilizing, Conrad came to see all forms of imperialism that conquered foreign peoples as violating their culture and being driven by the quest for wealth over moral concerns.