Why was Guanzhong one of the most developed and prosperous areas in China during the Han and Tang Dynasties?

Politically, the political situation is stable, Guanzhong area is the political center of the country, and the capital Chang 'an (Xi 'an) is here; Economically, developed economies are national trade centers, and the "Silk Road" has been opened one after another. In terms of culture, cultural prosperity, cultural integration and abundant talents provide spiritual support; Ideologically, open-minded, inclusive, compatible with the ideas of all ethnic groups, learn from others; In terms of policy, active foreign trade policy and ethnic policy, preferential development policy, encourage foreign trade; In terms of transportation, the political environment is stable, the transportation is developed, and the water and land are smooth; Geographically, Guanzhong Plain has fertile land and pleasant climate. Historically, dynasties accumulated and ruled stably; In other respects, the rulers of the dynasty were more enlightened in their ruling policies.