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 correct answer is <span>France and Britain
Eastern Mediterranean was in a problematic period due to history of colonization and wars and similar things and France and Britain were mostly the ones involved in all the problems. Eventually they completely left the area and left them to themselves and their own problems without further agitating anyone.</span>
Simon Bolivar wanted to create a unified Gran Colombia.
I believe It’s is false! Hope this helps
General Washington withdrew his troops to Pennsylvania.
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