Hello,
Because they were on the coast of a large body of water good for trade, food, and exploration.
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According to his autobiography, he wanted to make all things to be in the correct place so there might be a time order for businesses. He tried so hard to make this idea possible that he became more orderly.
It might be good to add that he understood that some of his goals were unrealistic.
It's purpose was to let people get good places in the government if they passed, but the only people that could take it were people that were already recommended into the government, so the rich and influential continued to run the government and the test was based on Confucianism.