French political thinker, historian, and diplomat renowned for his analyses of democracy and social conditions in Western societies, particularly in <i>Democracy in America</i>

Prussian geographer, naturalist, and explorer who co-founded modern geography and pioneered biogeography and geophysical measurement

German mathematician who pioneered analytic number theory, advanced Fourier series, and provided the modern definition of a function

Austrian diplomat, foreign minister, and chancellor who was central to the Concert of Europe for three decades, shaping 19th-century European diplomacy

King of Sweden and Norway from 1844 to 1859, and a noted composer, he was the second monarch of the House of Bernadotte

American writer, historian, and diplomat known for 'Rip Van Winkle' and 'The Legend of Sleepy Hollow,' and his historical works on Spain and George Washington

British author and literary critic best known for his 1821 work, Confessions of an English Opium-Eater, which inaugurated the tradition of addiction literature in the West

American abolitionist who fiercely believed in the violent overthrow of slavery and led the raid on Harpers Ferry