Answer:
The Shang Dynasty
Explanation:
The Shang Dynasty developed along the Yellow River
Agriculture was devastated and the Union blockade resulted in little trade.
Settling disagreements among ppl
Slavery caused a break in the democratic party.
While being easy to make and could hold many men, easy to defend and never really needed lots of men to defend them , trenches were actually extremely hard to get in and out of without being seen by the enemy, also cold, and wet, in turn the men on both sides would develop a infection called "Trench Foot" that would require amputation.