What innovation help maintain the growing populations during the tang and sung periods? ANSWER QUICK PLSSS

What are economic systems and how do they differ?

How did the northern u. s. change during the 19th century? select the best choice from the answers provided. a. it became more industrial. b. it became more agrarian. c. it became less populated. d. it became less diverse

Which is not a characteristic of capitalism? 1. market economy 2. supply and demand 3. freedom of competition 4. classless society