Which of these was not a form of national currency in the 1800s?

Copper coins

Explanation:

The dollar coin was developed based on several types of currency used in the country in the past. The first coins were issued in 1792, and were very similar to the coins used in Spain, Mexico and Peru. Many types of currency were available during the 1800s, particularly those made of gold or silver alloys. However, one form that was not commonly used was copper coins.

these civilizations were located around fertile rivers, where they could produce an abundance of crops

the correct statement is letter a.   according to the mandate of heaven, kings were considered godlike beings, so they could do as they .

the mandate of heaven is a chinese political and religious ideology used since ancient times to justify the rule of the king or emperor of china, that has been in place since the zhou until the dynasty system ended. it has been created to justify the zhou as the main power of the region. in order to keep harmony, the ruler has to make what he wants and what people want. he had to make good choices to satisfy the people and then they will be happy and keep you in power.