Jay was not successful, and it was only in 1783 that Spain formally recognized the United States through the reception of William Carmichael as Chargé d'Affaires ad interim.

[2] Joseph Edward Willard was appointed as Envoy but was elevated to the rank of Ambassador, presenting his credentials on October 31, 1913, marking a significant development in diplomatic relations between the two countries.

[2] Due to the turmoil of the Spanish Civil War, the American Embassy was temporarily moved to the U.S. consulate in Barcelona and later to St. Jean de Luz, France.

The Embassy was re-established in Spain on April 13, 1939, with H. Freeman Matthews recognized as Chargé d’Affaires ad interim in Burgos.

[4] It was designed by Ernest Warlow and Leland W. King with the collaboration of the Spanish architect Mariano Garrigues, on a plot where the palace of the Marchioness of Argüelles once stood.