Please watch the clips about Patrice Lumumba. Remember, the Congo was ruled by Belgium and experienced SEVERE abuse and extraction of resources. With the decolonization movement, independence leader Patrice Lumumba wanted a total elimination of Western meddling and exploitation of his country. When he was assassinated by the US and Belgium, a puppet ruler (Mobutu) was put in who continued to allow Western exploitation of the country. This is known as "neo-imperialism" or imperialism with an African figurehead.
