Hàncháo pài Zhāng Qiān chūshǐ Xīyù, kāipì le Sīchóuzhīlù.
The Han court sent Zhang Qian on missions to the Western Regions, opening up the Silk Road.
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汉朝 names the dynasty as a state, 汉代 the same years as a period: 汉朝的开国皇帝 'the founding emperor of the Han', but 汉代的文物 'relics of the Han period'. The name stayed: the Chinese majority are the 汉族, and Chinese characters are 汉字.