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The ( Gupta,Han dynasty,Roman Empire)) fell as the government became too unstable and weak to fight Huna invaders, promote trade, or maintain public projects. Fortunately, the empire influenced future generations with its highly developed sculptures, elaborate architecture of Hindu temples, and the creation of (Sanskrit,Classical,Calligraphy) literature.
Eventually, the empire was reunited. Historians believe that one reason was that people maintained a common( education system,enemy,language,religion) .