English Translation
They have had no rain in Africa for more than a month.
Why is it ‘einem’ Monat? I thought that einem would imply dative and that über usually uses accusative? 
“Über” can take both dative and accusative, depending on whether it is a direction or location.
But in this sentence, the case is dictated by “seit” (you can omit the über), which takes the dative case.
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