The first modern psychologist who was primarily interested in understanding the unconscious mind was

I believe the answer is: sigmund Freud

Technically, sigmund Freund was not the one that invented the concept of unconciousness, but he's definitely the one that popularized it. He promote the idea that our actions do not always influenced by the fators that we;re aware of, but the unconcious mind that lies within our state of mind could also influence the way we think without we even realizing it.

me no say

the factors that the economies of the muslim empires prosper were:

1- land trade routes-located between three continents  

2- sea trade routes

trade contributed to the spread of muslim empires, and with that islamic culture led to a growing feeling of internationalism resulted in the transfer of technology, science, and other cultural forms.