Kingdom of Portugal
After the Portuguese Restoration War of 1640–1668, the kingdom passed to the House of Braganza and thereafter to the House of Braganza-Saxe-Coburg and Gotha. From this time, the influence of Portugal declined, but it remained a major power due to its most valuable colony, Brazil. After the independence of Brazil, Portugal sought to establish itself in Africa, but was ultimately forced to yield to the British interests, leading to the collapse of the monarchy in the 5 October 1910 revolution and the establishment of the First Portuguese Republic.
United Kingdom of Portugal, Brazil and the Algarves
Accordingly, steps were taken to put an end to the personal union: Pedro I & IV agreed to abdicate the Portuguese Throne in favour of his eldest daughter, but he also wanted to ensure that her rights would be respected, and he further wanted to restore constitutional monarchy to Portugal. In order to put an end to the Portuguese absolute monarchy, the Emperor-King commissioned the drafting of a new Constitution for Portugal, that was widely based on the Brazilian Constitution. This document was finalized in less than a week.