Emperor Wu-di of the Han Dynasty was very competent and clear-sighted. His achievements in his 54-year reign can be roughly 
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summarized in the following three points. First, he  undertook  military expeditions  against  the Huns to safeguard  the border regions. 
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To the north of the Middle Kingdom there lived an ancient nomadic tribe named the Huns, whose cavalry had enabled them to contin-
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ually conduct raids southwards into the Middle Kingdom. Emperor Wu-di succeeded in launching a full military attack on the Huns and
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drove them out. For nearly half a century, the border regions were secured. Secondly, Emperor Wu-di managed to perfect the political
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and  economic systems of the country. Thirdly,  Emperor Wu-di made efforts to improve the national culture and education. He called
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for the collection of the ancient classics and set up an imperial university for the study of these classics.