South America

Argentine Republic
República Argentina (Spanish)

Plurinational State of Bolivia
Estado Plurinacional de Bolivia (Spanish)

Empire of Brazil (1822-1889)
Império do Brasil

Federative Republic of Brazil (since 1889)
República Federativa do Brasil (Portuguese)

Republic of Chile
República de Chile

Republic of Colombia
República de Colombia  (Spanish)

Republic of Ecuador
República del Ecuador

Co-operative Republic of Guyana

Republic of Paraguay
República del Paraguay (Spanish)
Tavakuairetã Paraguái (Guarani)

Republic of Peru
República del Perú (Spanish)
Piruw Ripuwlika (Quechu)
Piruwxa Ripuwlika (Aymara)

Republic of Suriname
Repoliku fu Sranan (Sranan Tongo)
Republiek Suriname (Dutch)
 

Oriental Republic of Uruguay
República Oriental del Uruguay

Bolivarian Republic of Venezuela
República Bolivariana de Venezuela