Early historians didn't have the technology modern historians had. So, they had less resources than more modern historians.
Industrialization is the main cause of urbanization in America, and one of reasons for America no longer being a farm dependent economy. Industrialization is also a reason for many technological advances and introduced the American economy of being able to own businesses and factories for profit.
Answer:
Persia is a historic region of southwestern Asia witch is associated with the area that is now modern Iran.
