Answer:Americans began to join the war. hundreds of thousands of them to be exact
Explanation:
Steel. Andrew Carnegie used it to mass produce steel cheaply and efficiency.
His ideas in section 2 discuss about student's minds resembling rice paddies, needing cultivation and rest. This idea leads to the unquestioned feature of Summer vacation in American education. In section 3, he begins to question it. He goes to the point of suggesting that Asian schools succeed because they have minimal or no summer vacation.
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