Capital Cities

Which Spanish speaking country's capital city has over 8 Million people living there?

More Questions from Capital Cities
Ottawa is the capital of which country?
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What is the capital of the United Kingdom?
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What city was built during the 1960s to replace Karachi as Pakistan's capital?
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Which of these continent - country - capital groups is correct?
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Situated on the Western coast of Africa, what is the capital of the Republic of Guinea?
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What is the capital of Chechnya?
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Situated on the Western coast of Africa, what is the capital of the Republic of Guinea-Bissau?
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What country in Africa with Accra as its capital uses cedi as its currency?
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