Portugal's population was remarkably homogeneous and had been so for all of its history. This lack of ethnic variety helped it become the first unified nation-state in Western Europe. For centuries Portugal had virtually no ethnic, tribal, racial, religious, or cultural minorities. Almost all Portuguese spoke the national language, almost all were Roman Catholic, and almost all identified with Portuguese culture and the nation of Portugal. Whereas neighboring Spain had been deeply divided along ethnic, linguistic, and regional lines all through its history, Portugal, which historically represented but one of the Iberian Peninsula's many regional entities, was united. In Portugal, ethnic unity and homogeneity were the rule, rather than the exception.

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