The Gatling gun, invented by Richard Gatling, was used in the Civil War and greatly influenced future warfare. Later versions were used in World War II and Vietnam. What was a Gatling gun?

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a plantation economy is an economy based on agricultural mass production, usually of a few commodity crops grown on large farms called plantations. plantation economies rely on the export of cash crops as a source of income.

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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.