;which does not describe all three kingdoms of ghana, songhai, and mali? a} built large cities in the west african rainforest b} grew powerful from trade c] ruled much of west of africa d] controlled the gold-for-salt trade

They built large cities in the West African rain forest.

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john maynard keynes developed new economic theories in response to the : b) great depression of the 1930s. his theories are so important that they are known as "keynesianism". in his works he supports the idea of a government with deeper involvement and intervention to end the great depression.