Tianjin is the largest coastal city in northern China. In terms of urban population, Tianjin is the fourth largest in China, after Shanghai, Beijing, and Guangzhou. In terms of administrative area population, Tianjin ranks fifth in Mainland China. The walled city of Tianjin was built in 1404. As a treaty port since 1860, Tianjin has been a major seaport and gateway to Beijing. During the Boxer Rebellion the city was the seat of the Tianjin Provisional Government. Under the Qing dynasty and the Republic of China, Tianjin became one of the largest cities in the region. At that time, numerous European-style
Science and technology in China had been growing by an average 36% each year during the previous decade. Chinese IT companies have been moving away from narrow downstream services and products to having a full range. China, with the active support of the Chinese government, is a leading pioneer in Internet of Things technology. According to the China Internet Network Information Center there were 751 million internet users as of 2017, with 53.2% of the population being internet users. The number of mobile internet users reached 724 million, with high penetration rates for mobile phones and broadband internet. By 2017, China has the largest e-commerce