[1] The annexation went through a plebiscite that took place in the city of Nicoya, in which, in the open town hall, the inhabitants of the municipalities of Nicoya and Santa Cruz voted to join Costa Rica, while the town of Guanacaste, today the city of Liberia, declined the annexation, however, on March 18, 1825, said population became part of Costa Rica by a law issued by the Congress of the Federal Republic of Central America.

Currently, the annexation of the Nicoya Territory is an anniversary of Costa Rica, which is celebrated with civic and cultural events in schools and communities across the country every July 25.

In 1555, as a result of the war of conquistadors in the viceroyalty of Peru, the Audiencia of Guatemala appointed Coroner of Nicoya to Pedro Ordóñez de Villaquirán.

In 1593, it was decided to add the Mayor of Nicoya to the province of Costa Rica, when King Phillip II confirmed the capitulations given to Diego Artieda Chirino in 1573, appointing Fernando de la Cueva y Escobedo.

From 1602 and for eighty years, the Mayor of Nicoya enjoyed political autonomy in its functions, independent of the colonial governments of Nicaragua and Costa Rica.

On December 13, 1820, the new Provincial Council divided the territory into seven parties: Segovia, El Realejo, León, Granada, Nicaragua (Rivas), Nicoya and Costa Rica.

However, on October 15, 1821, the Cabildo of Cartago agreed to annul the votes cast previously and to adopt the decision to stay out of the events, without assuming any commitment to Guatemala or León.

In spite of this, Nicoya continued to send his representatives to Cartago, since the independence agitation determined the need for frequent renewal of officials and the creation of government agencies, which strengthened the municipalities, such as Santa Cruz.

[3] The creation of the First Mexican Empire by Agustín de Iturbide in 1821 provoked the appearance of imperialist and republican factions, confronting each other, in several countries of the isthmus.

This rebellion, led by the liberal José Anacleto Ordóñez Bermúdez, was a consequence of the intention of the conservatives to annex the country to the Mexican Empire of Agustín de Iturbide.

Nicaragua also had pretensions about the territory, particularly because of the existence of large cattle ranches in the northern region, which were owned by Nicaraguan landowners settled in Rivas.

The activity of this port was making feel little by little its economic magnetism over the whole area of the gulf, as a center of demand for agricultural and livestock products, for its trade with the Central Valley and as a contact point to move between the different provinces and viceroyalties of the Spanish Empire, due to the constant arrival of ships from all over the continent.

[3] On March 3, 1824, the government of the State of Costa Rica officially proposed to the municipality of Nicoya its voluntary incorporation into the country, by means of a document inviting her "if it was convenient to meet her Province without opposing wills".

On July 4, an open town council was convened in Nicoya to discuss the matter, but attendees declined the invitation on the grounds that "this Party ... can not be a dissident.

Costa Rica, the economic, administrative and public service benefits, the creation of schools, security and quietness, referring to the state of war that Nicaragua lived at that time and the fear that it would spread to the populations of the Party, in addition to point out the indigence in which the towns of the same one and the own geography of the territory are like justifications for the union.

[4] The signatories of the act record in it as justification to the decision taken the following prerogatives:[4] The Act is signed by 40 people, among which the names of Manuel Briceño, Subaltern Political Chief and Commander of Arms of the Party stand out; the councilors of the Municipality of Nicoya, Toribio Viales, Ubaldo Martínez and Manuel García, as well as military and civil authorities and "the principals of this town".

In the change of opinion between the council of March 3 and that of July 25, the active participation of the Briceño Viales family was pointed out, which stood out at that time in the social, economic, religious, military and political aspects in Nicoya.