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In page War of the Spanish Succession:

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Portugal had regained its independence following the end of the Portuguese Restoration War in 1668, a result elements in Madrid had never entirely accepted. Peter II of Portugal viewed participation as a potential means of increasing his diplomatic standing in Europe, but Portuguese society was divided on which side to support. The British and Dutch navies posed a serious threat to their colonies, much of the mercantile class and aristocracy had considerable economic or cultural ties with France, while supporting Archduke Charles could result in another land invasion.[citation needed]