By completing with other nations and expanding boundaries
Answer:
Yellow River
Explanation:
The Shang ruled in the Yellow River valley, which is commonly held to be the cradle of Chinese civilization. However, Neolithic civilizations originated at various cultural centers along both the Yellow River and Yangtze River.
Trade is when two or more people exchange items such as food , money , books and etc...
When our country = America ( USA ) trades goods such as money , or food and medical supplies to other countries ( Nations ) to help them and in return we might get more supporters or better Technology.
I really hope that this helps you out a lot.
This is kinda hard sense they do produce a lot of major industries in the U.S like natural gas, tourism, etc.But as for the BEST answer I'd say D)
The answer is: American troops could invade Iraq if necessary.
