The effect was World war 1
I hope that's help !
Answer: A. Tang
Explanation: The Tang dynasty established a second Pax Sinica and the Silk Road reached its golden age, whereby Persian and Sogdian merchants benefited from the commerce between East and West
A,,,,,,,,,,,,,,.,.,.,..,.,.,..,,.,.,.
The surrounding land was severely deforested.
B.
Foreign conquerors forced the people to leave.
C.
Irrigation made the soil salty and unfit for farming.
D.
Disease reduced the population.
E.
Indus Valley populations migrated to Central Asia and Africa.
Answer:
A. The surrounding land was severely deforested , C. Irrigation made the soil salty and unfit for farming and D. Disease reduced the population. i think this helps.
Explanation: