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What do you think about the Gulf War?
Literal
Gulf War [about-について] how think-[question-ますか].
An opinion-solicitation question. 湾岸戦争 (わんがんせんそう) 'Gulf War' — specifically refers to the 1990-1991 war. 湾岸 = 'gulf coast/shore'. ~について ('about X, concerning X') marks the topic of discussion. どう思う is the standard 'what do you think' phrasing.