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In page History of Western Sahara:

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Western Sahara came under Spanish rule, despite attempts by the Moroccan sultan Hassan I to repel the European incursions on the territory in 1886[citation needed]. The oases of Tuat in the south-east went to the immense territory of the French Sahara. In 1898, in the aftermath of the Spanish–American War, Spain attempted to sell Spanish Sahara to Austria-Hungary[citation needed]; Spain wished to recoup its losses from the conflict and several Austrian ministers wished to obtain an overseas colony to justify naval expansion. However, as Austria-Hungary operated as a dual monarchy with Austria and Hungary having joint control over financial and foreign policy matters, the Hungarian House of Magnates vetoed the purchase and the colony was retained by Spain.