Capital Cities

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

More Questions from Capital Cities
Which Asian capital used to be called Peking?
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Which country is Nouakchott the capital of?
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What is the capital of Russia?
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What city's name means "Northern Capital", referring to the city's location in the north of China?
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Doha is the capital of what country?
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What is the capital of Guangdong Province and the third biggest city in China after Beijing and Shanghai?
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What is the capital city of New Zealand?
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What archaeological site in western Bolivia is the capital of an empire that flourished around AD 300 to 1000?
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