The strength of the US navy
Answer:
It appears that you are talking about the Middle Ages so the answer is 'C'. Irrigation goes back to pre-history and the fertile crescent.
Explanation:
The Mississippi River System, also known as Western Rivers, was important to trade and transportation in the west. It played a very important role in the lives of those people who inhabited the surrounding area. It was for transportation and also for trade.<span> </span>
B a social class system with farmers at the bottom
In a working economy, it requires labor to attain natural resources to produce other resources. then once a city is built and currency is established, entrepreneurship is required to buy and sell goods. Lastly, capital is required to keep order in the population
