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Under the Silla Dynasty, society was rigidly organized into a hereditary caste system. The Koryo Dynasty, which succeeded Silla, instituted a system of social classes according to which the rest of the population was subordinate to an elite composed of scholar-officials.
http://countrystudies.us/south-korea/6.htm#:~:text=Under%20the%20Silla%20Dynasty%2C%20society,elite%20composed%20of%20scholar%2Dofficials

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The kingdom also benefitted from natural resources such as iron and gold. Silla-manufactured goods included silks, leather products, furniture, ceramics, and metal tools and weapons, all of which were supervised by dedicated government departments.
https://www.ancient.eu/Silla/#:~:text=The%20kingdom%20also%20benefitted%20from,supervised%20by%20dedicated%20government%20departments

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Tang helped them conquer due to having Tributary state relationship. This stretched out to multiple branches of benefits such as ally, protection, more power, or whatnot.

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Due to Silla becoming a Tributary state under Tang, Cultural diffusion starts to occur. For instance this is brought by two different aspects. Modernization and westernization occurs simultaneously somewhat modernizing Korea while also integrating 3rd party cultures for instance the religion we believe or the clothes we wear.

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https://en.wikipedia.org/wiki/Silla#Military

During the Silla dynasty, Korea also builds multiple foreign relationships with 3rd party countries. Although most countries had malicious intents such as controlling Korea as a whole, the economy itself stretched out to communicating and building more foreign relationships.

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http://korea.prkorea.com/wordpress/english/2012/03/15/silla-kingdom/

As discussed earlier, due to the modernization that was brought to Korea the technology aspect of Korea started to thrive. One way of technology improvement was the architecture.