The best and most correct answer among the choices provided by your question is the second choice which is "railroad tracks."
<span>By 1860 the Midwest and the East were united by a network of railroad tracks.</span>
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the answer is A..,,I took the test and its the correct answer
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because Japan trading rights at to Japanese ports
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and there were resources like sugar cane in Hawaii so that's how I got the answer
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Those ideas have enabled successive generations to achieve an ... of science; and Chapter 11, Common Themes, pulls together ideas that cut across, although they can sometimes contribute to the discussion of such issues. Nevertheless, scientists differ greatly from one another in phenomena.
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