The Ostend Manifesto was a document created in 1854 by a group of American diplomats who were sent to Europe. They wanted to buy Cuba from Spain, a country that owned the island at the time. However, Spain did not want to sell the island to the U.S.
The diplomats believed that the U.S. needed to acquire Cuba to help expand the country and to prevent other countries like Britain or France from taking control of the island. They also felt that Cuba's location made it important for American interests in the Caribbean.
The Ostend Manifesto sparked controversy because it suggested that the U.S. should use force to acquire Cuba if necessary. When the document was made public, many people were upset and accused the diplomats of being greedy and imperialistic.
Despite the controversy, the U.S. did not end up using force to acquire Cuba. The issue of Cuba's ownership continued to be a source of tension between the U.S. and Spain. Eventually, the U.S. went to war with Spain in 1898 and gained control of Cuba, as well as other Spanish territories.