1800–1900 AD
From 1800 to 1900 AD, philosophers, economists, scientists, novelists, and political reformers transformed humanity’s understanding of liberty, industry, psychology, democracy, and the individual. Clausewitz redefined modern warfare; Goethe explored ambition and redemption; Schopenhauer examined suffering and human desire; Faraday revolutionized electricity and experimental science; Shelley and Hugo defended imagination, justice, and human dignity through poetry and fiction; Tocqueville analyzed democracy and equality in America; John Stuart Mill championed liberty, free expression, and representative government; Marx and Engels challenged capitalism and class society; Spencer argued against excessive state power; Dostoevsky explored morality, guilt, and faith; Mendel established the foundations of genetics; Tolstoy reflected on war, history, and the human condition; Nietzsche criticized modern culture and historical complacency; Freud introduced psychoanalysis; Dewey reshaped pragmatism and education; Bergson explored consciousness and creativity; Whitehead connected science with philosophy; and Böhm-Bawerk, Menger, Bastiat, and Henry George transformed economic thought. The 19th century was revolutionary because it witnessed the rise of industrial society, mass democracy, modern science, nationalism, socialism, psychology, and individual freedom, fundamentally reshaping politics, economics, philosophy, literature, and humanity’s understanding of itself.