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The proper answer to this question is that the battle of Saratoga is "it was the climax of the American revolution is happened in September 19 and also October 7 year 1777!
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Cane sugar proces of production is an agricultural activity which takes a large period of time and a massive effort from farmers. In the context of from cane plantation takes time and effort that European culture African slaves where suited to carry out this job. Also cane sugar production was a high quality resource to trade in Europe, in this sense african slaves where one of the most important ways to secure economic growth and power for Europe in terms of productive forces for sugar cane production.
"<span>D. Vikings conducted raids and trading expeditions from the Irish coast to the Caspian Sea" is the best option from the list because this was their main source of revenue. </span>