ANSWER: The tank was developed as a means to break the stalemate on the Western Front in World War I. Military technology of the time favored the defense. Even if an attack did succeed, it was almost impossible to exploit the breach before the enemy rushed in reinforcements to stabilize the front.
EXPLANATION: HOPE THIS HELPS!
Here is the excerpt from A Rumor of War which best illustrates Vietnam's uncomfortable climate:
<span><em>The tedium was occasionally relieved by a large-scale search-and-destroy operation, but the exhilaration of riding the lead helicopter into a landing zone was usually followed by more of the same hot walking, with the mud sucking at our boots and the sun thudding against our helmets while an invisible enemy shot at us from distant tree lines.</em></span>
The gold-for-salt trade made the Region very rich.
So they can have control over all the people in New York