Simple. In totalitarianism, as its name suggests, the government has TOTAL control of the country. No free press, other ideology bans, a strict police/military (and probably secret police), no freedom.
The Hans dynasty retains centralized burueacracy and unified political system of the Quin but adopts and grafts upon this the Confucian view that government should be run by educated, ethnical men.
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Because they had to pay for more materials to rebuild there buildings after the war
