One of China's main achievements during the Han dynasty was: building ships that could travel long distances
sending troops to attack parts of Europe.
cutting off China from all foreign trade
destroying the belief system of Legalism.

during the gan dynasty china became the most advanced country in the world

in contrast, the biological controls are self-sustaining, inexpensive and very effective once established. biological control could be used on thousands of golf course acres, improving their biodiversity and quality as wildlife habitat. in the process, the golf industry will be shown to be leaders in an environmental stewardship program of benefit not only to the lands they manage but also to the watersheds in which they exist.

the indians crossed artificial boundaries, setting the stage for conflict