Which line of city does Wuxi belong to?

Wuxi is a second-tier city. According to the treasure information of Wuxi, cities are divided into megacities, first-tier cities, new first-tier cities, second-tier cities, third-tier cities and fourth-tier cities. Wuxi's per capita income is in the top ten in China, but its population is far less than that of first-tier cities, and it belongs to second-tier cities. Wuxi, referred to as tin for short, is a prefecture-level city under the jurisdiction of Jiangsu Province, located in the east of China and the south of Jiangsu Province. Wuxi is an important birthplace of Jiangnan civilization and Wu culture. It is said that Wuxi is named after the exhaustion of Xishan tin mine. It is the central city of the Yangtze River Delta, an important part of Shanghai metropolitan area and Suzhou-Wuxi-Changzhou metropolitan area, and a modern national industry and commerce in China.