This episode of Crash Course European History explores the complex and often brutal history of 19th-century European imperialism. Host John Green examines the paradox of European nations expanding rights and democracy at home while simultaneously stripping rights and sovereignty from people across Asia, Africa, and the Pacific. The video details the economic motivations behind expansion, such as the demand for raw materials like palm oil, rubber, and diamonds, and the specific mechanisms used to enforce control. Key themes include the "Tools of Empire"—technological advancements like steamships, machine guns, railroads, and the medical breakthrough of quinine—that enabled Europeans to penetrate and dominate the interiors of Africa and Asia. The video also highlights the shift in justification for empire from religious conversion to "Social Darwinism," a pseudoscientific belief in racial superiority used to excuse exploitation. Crucially, the video moves beyond the perspective of the colonizers to focus on indigenous resistance and experience. It covers the Opium Wars in China, the Indian Rebellion of 1857, and forms of non-violent resistance such as "reproductive strikes" in the Congo and Caribbean. This resource is invaluable for helping students understand the systemic nature of colonialism, the technological disparity of the era, and the lasting geopolitical legacy of these events.