The Qin dynasty was the first dynasty to start connecting the various walls into a greater whole. That happened around 221 to 206 BC and was done under the reign of Qin Shi Huang. Though the wall was later improved still by other dynasties, it was during the Qin dynasty that the Great Wall of China was first formed into a cohesive structure.
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Because there probably to old.
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Explanation:
Jefferson banned all British ships from U.S. ports, ordered state governors to prepare to call up 100,000 militiamen, and suspended trade with all of Europe. He reasoned that U.S. farm products were crucial to France and England and that a complete embargo would bring them to respect U.S. neutrality.