Spain declares war on Great Britain on June 21, 1779, during the American Revolutionary War.
France had declared and war on Great Britain in February 1778, and the Spanish joined the French against England, and on April 12, 1779, José Moñino y Redondo, Count of Floridablanca and Spain’s minister of foreign affairs and French ambassador Armand Marc, Count of Montmorin, signed the Treaty of Aranjuez, effectively bringing Spain into the American Revolutionary War. Spain finalized this treaty and declared war against Great Britain on June 21, 1779.