2. During the prosperous Tang Dynasty, Chang 'an, the capital, was the world cultural and artistic center. The Tang Dynasty was the earliest historical period of "opening to the outside world" in the history of China, and now the "Chinatown" abroad is the physical witness left by the cultural exchange and settlement of China people in that era.
3. The laws and regulations, astronomical calendar, calligraphy art, architectural technology, living customs (clothing, tea ceremony), coins and characters in the Han and Tang Dynasties have had a far-reaching impact on all countries in the world today, and made great historical contributions to the cultural exchange between China and other countries.