The early part of 1820 was disturbed by some irruptions of the Spanish Americans under Artigas, on the eastern side of the Plata. The Portuguese troops, however, soon repulsed him, and strengthened their line by the occupation of Taquarembo, Simar, and the Arroyo Grande.

Meantime the peace in Europe had not brought back all the tranquillity that was expected from it. In vain did the old governments expect to step back into exactly the same places they had occupied before the revolutionary war. The Cortes had assembled in Spain. Naples had been convulsed by an attempt to obtain a constitution similar to that promulgated by the Spanish Cortes; and now Portugal began to feel the universal impulse. Lisbon and Oporto were both the seats of juntas of provisional government, and both assembled Cortes to take into consideration the framing of a new constitution, and the reformation of ancient abuses. On the 21st of August the Cortes of Lisbon had sworn to adopt in part the constitution of the Spanish Cortes, but it was not until the month of November that the government of Brazil made public the recent occurrences in the mother country. Indeed it was not to be expected that Brazil should remain unconscious of the proceedings of Europe. The provinces were all more or less agitated. Pernambuco was as usual foremost in feeling, and in the expression of feeling. A considerable party had assembled at about thirty-six leagues from Olinda. They declared their grievances to be intolerable, and that nothing but a total reform in the government should reconcile them to longer subjection to the government of Rio. The royalist troops were sent out against them and were victorious, after an action of six hours, in which they lost six officers and 19 men killed, and 134 wounded. The loss on the other side was much greater, and as usual severe military executions increased the evils of the civil war, at the same time that they farther exasperated the people, and prepared them for a future and more obstinate resistance.

Bahia was far from tranquil. The old jealousy which had subsisted from the time the seat of government had been transferred from the city of St. Salvador to Rio, combined with other causes, tended to increase the desire of a constitutional government, from which all good was to be expected, and under which, it was hoped, that all abuses would be reformed. Rio itself began to manifest the same feelings. The provinces of St. Paul's and the Minas were always ready to unite in any cause that promised an increase of freedom; and the whole country seemed on the brink of revolution, if not civil war.

The court party, however, still flattered themselves that the determination of the King to remain in Brazil, instead of returning to Lisbon to put himself into the power of the Cortes, would be so grateful to the Brazilians, that they would be contented to forego the probable advantages of a constitution, for the sake of the positive good of having the seat of government fixed among themselves. But it was too late; the wish for improvement had been excited. The administration had been too corrupt, the exactions too heavy to be longer borne, when reform appeared to be within reach. The very soldiers became possessed with the same spirit, and though highly repugnant to the King's feelings, it soon became evident that a compliance with the wishes of the people and with the constituton, as declared by the Cortes at Lisbon, was inevitable.

It is said, that some of the wisest ministers hail long pressed His Majesty to a compliance with the wishes of his people, but in vain. His reluctance was unconquerable, until at length, perceiving that force would certainly be resorted to, he adopted a half measure which probably accelerated the very event he was anxious to avoid.[30] On the 18th of February, 1821, the King accepted as a junta, to take into consideration such parts of the constitution as might be applicable to the state of Brazil, the following persons:—

Marquez de Altegrete—President
Baron de St. Amaro.
Luiz José de Carvalho Mello.
Antonio Liuz Pereiro da Cunha.
Antonio Rodriguez Velloso dc Oliviera.
Joaŏ Severiano Maciel da Costa.
Camillo Maria Tonelet
Joaŏ dc Souza de Mendonça Costa Real.
José da Silva Lisboa.
Mariano José Pereira da Fonseca.
Javŏ Rodriguez Pereira de Almeida.
Francisco Xavier Pires.
José Caetano Gomez.
Procurador da Casa.
José de Oliviera Botelho Pinto Masquiera.
Secretarios.
Manoel Jacinto Noguerra de Gama.
Manoel Moreira de Figueiredo.
Secretaries Sustituti.
O Coronel Francisco Saraiva da Costa Refoios.
O Desembargador Joaŏ José dc Mendonza.

These persons were all anxious to retain the King in Brazil. Most of them Brazilians, they had felt the advantage of having the seat of government fixed among themselves, and though the King's foreign allies and his Portuguese subjects had pressed him to return to Europe, his own dread of the Cortes of Lisbon, together with their natural desire to detain him in Brazil, produced on the 21st a manifesto, describing His Majesty's affection and relianceon his Brazilian subjects, and stating, that he was resolved to send the Prince Don Pedro to Lisbon, with full powers to treat on his behalf with the Cortes, whom he seems to have considered as subjects in rebellion.

The Prince was also to consult with the Cortes concerning the drawing up of a constitution, and the King promised to adopt such parts of it as might be found applicable to existing circumstances and to the peculiar situation of Brazil. This manifesto appears to have produced an effect very different from what was intended. At four o'clock in the morning of the 26th, all the streets and squares of the city were found full of troops. Six pieces of artillery were planted at the heads of the principal streets, and the most lively sensation agitated every part of the city of Rio. As soon as this circumstance could be known at San Christovaŏ, the Prince Don Pedro, and the Infant Don Miguel, came into the city. The Camara[31] was assembled in the great saloon of the theatre.[32] The Prince, after conferring for a short time with the members of that body, appeared upon the balcony of the saloon, and read to the people and the troops, a royal proclamation, antedated the 24th, securing to them the Constitution, such as it should be framed by the Cortes of Lisbon. This was received with loud cries of Viva el Rei, Viva a Religiaŏ, Viva a constituicaŏ. The Prince then returned to the saloon, and ordered the secretary of the Camara to draw up the form of the oath to be taken to observe the constitution, and also a list of a new ministry, to be submitted to the people for their approbation. The list of ministers was first read, and each individually approved.[33]

His Royal Highness then proceeded to take the oath for his father, in the following form:—

"I swear, in the name of the King, my father and lord, veneration and respect for our holy religion; to observe, keep, and maintain for ever the constitution such as established by the cortes in Portugal." The bishop then presented to him the holy Gospels, on which he laid his right hand, and solemnly vowed, promised, and signed the same.