The Chancellor of Nicaragua, Norman Caldera, stated that Nicaragua was willing to go to the International Court in the Hague to ask them to return Guanacaste to its original owner.  In 1825 "Guanacastecos" voted to secede from Nicaragua, then joined Costa Rica as the seventh province.  This action was ratified in the 1858 Cañas-Jeréz treaty that delimited each countries borders. 

Caldera, stated that this was a response to Costa Rica’s petition in the same court and had been suggested to the government by several Nicaraguan legal experts.  "There are some who say, well if Costa Rica is going to put in doubt the Cleveland Letter, then we should too. For example, ask them to give back Guanacaste". 

Costa Rican President Abel Pacheco, wasn’t interested in debating the possibility "I will not analyze this, because it is completely out of line, I have nothing to say".   Costa Rica’s top diplomat, Roberto Tovar, stated that "this matter was settled ages ago.  In 1858, Costa Rica and Nicaragua agreed in treaties to each nation’s borders."   He explained that in the 1858 Cañas-Jeréz treaty clearly states that the San Juan River belongs to Nicaragua (one of very few border rivers in the world that belongs to one country), and that Nicoya "was, is and always shall be a part of Costa Rica".

• In 1812 the Spanish Constitution divided the territory of the Realm of Guatemala in political districts. One of them was the District of Nicoya, part the actual Province of Guanacaste, which depended upon Nicaragua for its political and civil administration.

• The District of Nicoya was made up of the Palenque Diriá (today Santa Cruz), Siete Cueros (today known as Filadelfia) and the town of Guanacaste (today called Liberia).

• The internal conflicts in Nicaragua caused the people of Nicoya to have closer contact with the Costa Ricans in Puntarenas, Esparza, Bagaces and Cañas.

• After a plebiscite on July 25th 1825, defined by Dictionary…. as "A vote in which a population exercises the right of national self-determination" the District of Nicoya annexed itself to Costa Rica. The union was ratified in the Cañas-Jerez Border Treaty of 1858 between Costa Rica and Nicaragua. Later it was ratified in the Cleveland Letter of 1888.