Provinces
Dinis's successor, Afonso IV (1325–1357), instituted a system of six official comarcas, that reflected a concrete definition of these regions: Antre Douro e Minho, Antre Douro e Mondego, Beira,Estremadura, Antre Tejo e Odiana and Algarve. Between the reign of Afonso IV and the 20th century there were numerous alterations to the limits of the nation, a consequence of development and population growth. Further modifications to the limits of these provinces occurred in the Plano de Ordenamento da Mata Nacional da Machada (1864), the first scientific delimiting of forest resources, and the Projecto Geral da Arborização dos Areais Móveis de Portugal (1897), which modified land usage along the coast.
But, until 1832, the provinces did not serve an administrative function, although they did mark the differences in habits, linguistic peculiarities and socio-cultural characteristics. The province remained a military designation, chiefed by the General das Armas (English: Military Governor), expressly forbidden from influencing municipal affairs. During the Liberal regime, some of the liberal politicians conceived an administrative system where provinces were the top level tier of government, maintaining their former names, but with different frontiers. The debate over the importance of provinces only arose from fears that there would be an excessive concentration of power in the hands of governmental officers (Portuguese: prefeitos). The adoption of the 17 districts (1835) instead of eight provinces was an attempt to dissolve such power.
But, by 1976, the distinction was once again dropped, even as Portugal was divided into regions (Portuguese: regiões) or provinces (Portuguese: províncias). There was a substantial difference between the European provinces and regions and the overseas colonies (the so-called overseas provinces). The Provinces were inspired by the geneticregions of Portugal and royal Comarcas, and used by the Estado Novo dictatorship to characterize traditional and rural Portugal in the first half of the 20th century. Yet, the Districts continued to define administrative and political control, much like the organization of public security for the State, limiting the powers of local government. This organizational structure for the territory resulted in a loss of the sense of regional identity, which was only kept alive by oral traditions, based on regional references of origin.
Following the Carnation Revolution, the regions and provinces were abolished and the districts became the second level administrative regions.
Read more about this topic: Administrative Divisions Of Portugal, History