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 B. Sahara Desert
Hope this helps! :)
Answer:
The Middle Colonies enjoyed a successful and diverse economy. Largely agricultural, farms in this region grew numerous kinds of crops, most notably grains and oats. Logging, shipbuilding, textiles production, and papermaking were also important in the Middle Colonies
Explanation:
so I guess its either shipbuilding or logging
