'A' is for Argentina, and it so happens that this country has a stamp that shows the whole continent.
The second largest country in South America, Argentina gained its independence in 1816 and issued its first stamps in 1858.
'B' is for Brazil, the largest country in the continent; independent in 1822 Brazil became a republic in 1889. The Amazon flows from its source in the Peruvian Andes 4000 miles through Brazil to the Atlantic.
'C' is for Chile which lies between the Andes and the South Pacific. Chile's Juan Fernandez Islands are supposed to be where Robinson Crusoe was shipwrecked.
|Chile (my one and only stamp)|
'E' is for Ecuador which became independent in 1822. Ecuador includes the Galapagos Islands so I'm pleased that I have a stamp of its fauna, a splendidly named bird on a 1977 stamp.
If like me you don't know Spanish, the bird is a Red-legged Boobie.
I had only one stamp from other countries on the continent and so had to give Guyana (formerly British Guiana), Paraguay, Peru and Venezuela a miss and settle for the letter 'U'.
'U' is for Uruguay, the smallest of the South American republics which borders on the Atlantic; its first stamps were issued in 1856.
I understand that 'encomiendas' means 'parcels'
For other stamps from down South America way you need to visit Viridian at Sunday Stamps 36