To put it simply, Kyoto was built based on chang'an but on a smaller scale.
Both cities have similar layout. At that time, the layout of Chang'an city is perfect for the purpose of Capital city in the aspect of it's defense and land division.
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The best known statement of the theory of nullification during this period was said by John C. Calhoun
People think that it is a war that we should have not fought because we didn’t win, many soldiers were killed, and south Vietnam’s became communist after the 20 year war.