As neighbors and early rival nations, Portugal and Spain have been associated for much of their histories. Yet despite their geographic proximity on the Iberian Peninsula and shared past, each boasts distinct social, cultural, and economic identities. Readers will examine the evolution of each country, witnessing the rise of their earliest civilizations, their dramatic rivalry during the Age of Discovery, their days as empire-builders, their struggles through authoritarian regimes, and their emergence as independent nations and members of the European Union.