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 result of the big three alied leaders at yalta was, they agreed that Germany will be divided into four zones , it capital Berlin will also be divided
<h3>Demilitarization and Denazification of Germany</h3>
The allied big three leader are Roosevelt leader of the United States, Churchill British Prime Minister and Stalin Soviet union leader, the meeting took place at Yalta during the second word war.
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<em>Not 100% </em><em>sure but I think It was caused of the finding of the New World Aka The united States of America</em>
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<em>Because england, spain, britain, dutch and muslim were all fighting for the land</em>
