Answer:
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Explanation:
Please provide more detail!
I think a and d but I could be wrong
Communities with war industries experienced an immediate labor surplus when those industries closed down, and the large numbers of returning soldiers added to the unemployment problem.
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The correct answer is A. Technological advances such as s<em>team power, air brakes, automatica lubricators and steel tracks</em> have affected the railroads very positively, since it has made it possible that the rail network could become a safer, more efficient and more reliable means of transportation for goods.
