Why Beijing (Beiping) has always been the capital's first choice, but Nanjing is not, just as Japan disappeared as soon as it entered Nanjing. Under the contrast of geography, history and military aff

Why Beijing (Beiping) has always been the capital's first choice, but Nanjing is not, just as Japan disappeared as soon as it entered Nanjing. Under the contrast of geography, history and military affairs Beijing is the capital's first choice. Historically, the number of times in Nanjing is no less than that in Beijing. Traditionally, the northern regime has chosen Beijing and the southern regime has chosen Nanjing, so that it can rely on the rear area to advance and attack, and retreat and defend. China has always been dominated by North and South, so Beijing seems to have an advantage over Nanjing. In fact, the geographical environment of the two countries is similar, both of them are close to mountains and rivers, and the situation is steep, easy to defend but difficult to attack, while the Japanese attack, Beijing.