Raguet became the first chargé d'affaires from the United States to Brazil on October 29, 1825. One of the first issues he dealt with was the blockade of Argentine ports by the Brazilian navy during the Cisplatine War. Argentina was a growing trade partner of the United States and Raguet and his counterpart in Argentina worked to convince Brazil to restrict its blockade to only certain ports and that ships approaching the blockade should be given warning before being seized by Brazil. After negotiations, Brazil restricted its blockade to only ports in the Río de la Plata, but the blockade still encompassed more ports than the United States was pressing for. Brazil never made it a policy to give ships warning, but many ships were warned and let go.