New scientific knowledge help the building of the Panama canal because there was a decrease of workers getting sick of malaria and yellow fever. It was Colonel Gorgas, the Chief Medical Officer, who have read about discoveries linking mosquitoes and malaria. Due to these readings, he succeed in eradicating the cause of the disease therefore a decrease in people getting sick.
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I can't see your answer choices so hope this helps:
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A nation's wealth is determined by its accumulation of all tangible products. ... When a nation's total output increases over time, the nation is experiencing: a decrease in gross domestic product,
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The United States exercises its foreign policy through economic aid. In the years after World War II, the United States was guided generally by containment, the policy of keeping communism from spreading beyond the countries already under its influence.
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B. The Republicans wanted more cuts in social spending
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Good luck on your test.
The Great Dust Bowl
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