Chinese did exams on basic things like their culture to see if they know enough for a better job.
The Ming dynasty started in 1368 AD and ended in 1644 AD.
Isolationism
Ming emperors decided to isolate China to protect China.
The Ming dynasty started by Zhu Yuanzhang when he overthrew the Yuan dynasty. The Ming dynasty ended up becoming one of the most stable dynasties.
Zheng He's Voyages
Zheng He was a explorer who went on seven great trips/voyages.
Chinese did service exams based on law, math, culture, and language to show how much they know and how good of a job they can get. A flaw with the exams are the wealthy could bribe test examiners for a better job.
Expanding the Great Wall of China
The Ming dynasty added a lot of length to The Great Wall of China.
Ming emperors decided to isolate all of China to protect it from the europeans. It was to maintain China and so the Mongols couldn't threaten them.
Zheng He lead seven great voyages to the South China Sea, Indian Ocean, Arabian Sea, Red Sea, and the eastern coast of Africa. His voyages lasted from 1405 to 1433.
The Ming dynasty added over five thousand miles to the Great Wall of China in the span of 276 years.