Editors. "Spain and France give Portugal ultimatum". The Literary Encyclopedia. First published 01 March 2010
[http://www.litencyc.com/php/stopics.php?rec=true&UID=13501, accessed 03 September 2015.]
The convention between France and Spain to issue an ultimatum to Portugal was intended to break that country's traditional allegiance to Britain which, if not accepted, will lead to war (promulgated by the Treaty of Aranjuez, Mar. 21st, when Spain also agrees to cede Louisiana to France)
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