Yes yes all this talk of things that happened in 1820-33 is irrelevant.
In 1765, Capt. John Byron, explored Saunders Island in the west, and named the harbour Port Egmont, and claimed this and other islands for Britain on the grounds of prior discovery. The next year Captain John MacBride established a British settlement at Port Egmont. These events were nearly the cause of a war between Britain and Spain, both countries having sent armed fleets to contest the barren but strategically important sovereignty of the islands.
Oh yes prior discovery.....
English explorer John Davis, commander of the Desire, one of the ships belonging to Thomas Cavendish's second expedition to the New World, separated from Cavendish off the coast of what is now southern Argentina, he decided to make for the Strait of Magellan in order to find Cavendish. On 9 August 1592 a severe storm battered his ship, and Davis drifted under bare masts, taking refuge "among certain Isles never before discovered." Consequently, for a time the Falklands were known as "Davis Land" or "Davis' Land."
In 1594, they were visited by English commander Richard Hawkins, who, combining his own name with that of Queen Elizabeth I, the "Virgin Queen", gave the islands the name of "Hawkins' Maidenland."
A little earlier than 1820, although we can excuse any lack of knowledge, afterall Argentina as it is today only existed properly after the constitution of 1853, 261 years AFTER John Davis and the Desire.