What is the history of Nanjing? Introduce it in detail!

Nanjing, abbreviated as Ning, is the capital of Jiangsu, a sub-provincial city, the second largest city in the Yangtze River Delta and East China, the third city in China for science and education, the central city of China countries (East China), an important political, military, scientific, educational, cultural, shipping and financial center in China, a national transportation hub, communication hub and scientific and technological innovation center [6], a core city in the Yangtze River Delta metropolitan area and an important gateway city for the development of the central and western regions. Nanjing has a long history. It is the first batch of national historical and cultural cities and national key scenic tourist cities. It has a history of more than 6,000 years of civilization, nearly 2,600 years of city building and nearly 500 years of capital building. It is one of the four ancient capitals in China, known as "the ancient capital of six dynasties" and "the metropolis of ten dynasties", and is an important birthplace of Chinese civilization. Located in the lower reaches of the Yangtze River, Nanjing is an important transportation, port and communication hub in China, as well as a service outsourcing base in China, a national software export innovation base, a national informatization and industrialization integration experimental zone, the only national pilot city for comprehensive reform of science and technology system, an innovative city and a pilot city for triple play. Nanjing is an important national gateway city, a central city and an important industrial city in East China, a shipping and logistics center in yangtze river international, and an ecologically livable city along the river. Won the special honor award of UN-Habitat. 20 14 The 2nd Summer Youth Olympic Games will be held soon.