Estado Novo (Portugal)
King Carlos I of Portugal confirmed colonial treaties of the 19th century that stabilized the situation in Portuguese Africa. These agreements were, however, unpopular in Portugal, where they were seen as being to the disadvantage of the country. In addition, Portugal was declared bankrupt twice—first on 14 June 1892 and again on 10 May 1902—causing industrial disturbances, socialist and republican antagonism, and press criticism of the monarchy. Carlos responded by appointing João Franco as Prime Minister and subsequently accepting Parliament's dissolution. In 1908, Carlos I was assassinated in Lisbon. The Portuguese monarchy lasted until 1910 when, through the 5 October revolution, it was overthrown and Portugal was proclaimed a republic. The overthrow of the Portuguese monarchy in 1910 led to a 16-year struggle to sustain parliamentary democracy under republicanism – the Portuguese First Republic (1910–1926).
United Kingdom of Portugal, Brazil and the Algarves
With the death of the Portuguese King John VI on 10 March 1826, his heir apparent, Brazilian Emperor Pedro I, inherited the Portuguese Crown, and reigned briefly as King Pedro IV. On 20 March 1826 the proclamation of the Brazilian Emperor's accession to the Portuguese Throne was made public by the Portuguese Council of Regency (that had been instituted by King John VI during his final illness, and that was led by the Infanta Isabel Maria, daughter of John VI and Pedro I & IV's sister). With this union of Crowns, the monarchies of Portugal and Brazil were once again briefly united, but there was no thought of a reunification of the two separate States. Accordingly, this brief union of Crowns in the person of Pedro I and IV remained always a personal union only, and not a real union or a rebirth of the United Kingdom.