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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Answer:
for this question number 3 is b
I believe the answer is Jews
During the 1600s and 1700s, Prussian kings built a strong nation by <u>industry</u>. :)