Definition of ostend manifesto in English English dictionary
(1854) Secret document written by U.S. diplomats at Ostend, Belg. , describing a plan to acquire Cuba from Spain. On orders from U.S. secretary of state William Marcy, three U.S. diplomats minister to Britain James Buchanan, minister to France John Y. Mason, and minister to Spain Pierre Soulé devised a plan to purchase or, if necessary, seize Cuba for the U.S. Publication of the aggressively worded document, and Soulé's advocacy of slavery, caused Marcy to denounce it