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American women's rights activist, author, and civil rights advocate who was a leading figure in the women's suffrage movement

Dutch author, civil servant, and colonial administrator best known for his novel Max Havelaar, which exposed the abuses of colonialism in the Dutch East Indies

English philosopher and political theorist who coined "survival of the fittest" and applied evolutionary principles to sociology and ethics

French photographer, balloonist, caricaturist, and journalist who took the first aerial photographs and whose portraits are held in major national collections

Swedish classical singer and opera star known as the 'Swedish Nightingale' who achieved immense popularity across Europe and the United States

German philosopher, sociologist, and economist who co-authored The Communist Manifesto with Karl Marx and developed the political and philosophical system known as Marxism