The powerful personalities of Ferdinand and Isabella had a major impact on the societies and states of early Europe and America. They unified Spain under one government, established the new Inquisition in 1478, and affirmed the country's Catholic Christian identity by forcing Muslims and Jews to convert to Christianity. They sent Christopher Columbus to discover a 'New World'. Their influence has passed centuries, providing political and cultural role models during the dictatorship of General Francisco Franco. Powerful figures in history have generally achieved dominance as individuals, and...