#1 CHINA BECAME THE LARGEST NATION IN THE WORLD
During the Tang Dynasty, China reached unprecedented heights becoming the largest and strongest nation in the world. It covered most of the territory of present-day China, Vietnam, and much of Central Asia as far as eastern Kazakhstan. Its capital Chang’an (present-day Xi’an) was the most populous city in the world at the time. It was a cosmopolitan urban center with considerable foreign populations from other parts of Asia and beyond.
thats one I know and I really hope it helps