Not unlike Livingstone, Stanley's writings and explorations sparked much societal debt and curiosity in Africa.
King Leopold starts to expand into central Africa and sends in Henry Stanley in order to insure trade relations with native peoples. His tails also spark interest in exploration, the sense of European superiority, and movement towards the conquest of Africa.
Text Book, McKay, Chapter 24, Page 814.
Source Book, Henry Stanley, "A White Explorer in Black Africa" Chapter 24, Page, 393-396