Lisbon Regicide
The assassination of King Carlos and the Prince Royal was the effective end of a constitutional monarchy in Portugal (later confirmed by the 5 October 1910 revolution). The regime functioned for another 33 months with growing agitation and demands for reform (although considerably less than in the future First Republic). It cannot be denied that the weak and permissive attitude in the Government of Acclamation was an incentive for the Republican Party to attempt another coup. The assassinations did not change the system of government; instead, they delayed the change.
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.