Allows us to compare the value of goods and services
They remained focus on farming and trading
It depends on the time period. In the 1600s when they just settled in Jamestown, they most likely didn’t know that they were there (at least how many were there) but later, of course they started driving them off so they could build more of America. I’m actually studying this in school right now so I hope I am correct. Don’t be sure this is right though...
Answer:
It was the Mongols who invaded Ming Empire and defeated Ming Army.
Economics is the answer to the question