Answer:
Xia
first dynasty
formed by yu the great
Shang
System of writing
bronze technology using peice mold casting formed by king cheng tang
The person who perfected the steam engine is the very known inventor and early-day scientist James Watt. His work on the steam engine made it widely used and one of the most profitable and turn-overable areas of the industry during those times.
It was the population policy of the 21st century.
When 20th century ends, the desirable social goal
was sustained and broadly accepted from local and regional levels to the world.
To most citizens of America, the population is not really an issue, but it has
been for the past decades because low population may mean demographic issues.
The answer will be c im pretty sure
