Let’s start with a riddle: “It” grew for almost 1,000 years, until “it” was more than 175 miles long. “It” created many temporary, and at least 4 large permanent lakes as “it” expanded. “It” took tons and tons of gun-powder, dynamite, and nitroglycerin, and roughly 3,000,000 man-hours to finally destroy “it”. WHAT WAS “IT”? If

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