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Over the years since the Industrial Revolution, the prices were raised in the U.S.. The companies in the United States decided it was cheaper in foreign countries for example, China India and Taiwan.
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Before the 1960's there were very few crops that made it through to the harvest because of insects eating away the crops, drought, and poor soil. Since the 1960's, some of the new machinery are helpful during drought seasons, tillers that break up the soil to allow nutrients to penetrate through.
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