Letters from Alfred Cobb to William Tudor,

Six letters, including copies of correspondence with Lieutenant John Percival and other officials regarding a demand for a "forced contribution" of one thousand dollars to a South American military officer. Also includes a letter and report on the condition of United States commerce in South America. Two letters are in Spanish.

Letters from John Orde Creighton to William Tudor,

Five letters on topics including General Juan Lavalle and warring factions in Buenos Aires and news of mutual friends and associates.

Letters from John Orde Creighton to William Tudor,

Six letters on topics such as the Brazilian export duty, the movements of other naval officers, and interactions with various dignitaries

Letter from William Dana,

One letter requesting assistance with a claim against the Brazilian government relating to the condemned schooner Joseph Meade.

Letter from Edward Everett to William Tudor,

One letter regarding the arrival of James Cooley as American chargé d’affairs in Lima.

Letters from John Murray Forbes to William Tudor,

Seven letters in which Forbes updates Tudor on relations between the provinces and provides introductions to various Argentinian diplomats sent to Brazil. He also includes a copy of a letter in Spanish sent to him from the Argentinian minister of war and foreign relations regarding peace negotiations with Brazil along with letters to the United States legation and Tudor regarding American involvement in light of the Monroe Doctrine.

Letters from John Murray Forbes to William Tudor,

Five letters relaying news of the Decembrist revolution and Buenos Aires Governor Manuel Dorrego’s execution, as well as developments in other Argentinean provinces. Forbes also writes about a personal conflict with Commodore James Creighton, and requests Tudor’s assistance in intervening on behalf of American citizens.

Letters from John Murray Forbes to William Tudor,

Five letters regarding the arrival of English Admiral Robert Waller Otway, the movements of Juan Lavalle and his troops, and the "feverish state" of the population of Buenos Aires in light of the recent violence associated with the Decembrist revolution.

Letters from John Murray Forbes to William Tudor,

Six letters regarding ongoing civil wars in the Argentinean provinces, peace negotiations, and Forbes’ implementation of the Monroe Doctrine, as well as diplomatic discussions with the provisional government in Buenos Aires, which sought American intervention. Forbes also includes a copy of a letter he wrote to the provisional government regarding privateering.

Letters from John Murray Forbes to William Tudor,

Five letters regarding the peace negotiations between Argentinean factions. He also writes of news of the intentions of Spain to establish a "paternal government" in Mexico.

Letters from John Murray Forbes to William Tudor,

Four letters in which Forbes discusses the peace achieved in Buenos Aires, and the question of whether to reinstall the junta that was overthrown in the Decembrist revolution, as well as a meeting with the new governor, Juan Manuel Rosas. He also describes the response in Buenos Aires to the peace reached between Colombia and Peru, and the funeral of executed Buenos Aires Governor Manuel Dorrego.

Letters from Michael Hogan to William Tudor,

Four letters discussing news of friends and domestic politics and the presidential election, in addition to trade and purchases of certain goods.

Letters from Michael Hogan to William Tudor,

Four letters regarding unrest in Chile, the election of Vice President Joaquín Vicuña and inception of the Chilean Civil War, and subsequent events related to the war.

Letter from Isaac Hull to William Tudor,

Three letters regarding the court martial and trial of Tudor’s brother-in-law, Charles Stewart, and French naval activities in the area. One letter was written by Hull’s wife.

Letters from Thomas ap Catesby Jones to William Tudor,

Two letters in which Jones requests that Tudor relay his regrets to José de la Mar for missing the general’s installation as president of Peru, and mentions he is sending Tudor an ensign to be used "at the Palace."