Preemption
This doctrine is centered around the attempt to repel or defeat a perceived imminent offensive or invasion. The aim is to gain a strategic advantage in an impending (allegedly unavoidable) conflict shortly before it materializes into a crisis. Its principles include unilateralism and the use of preventative war.
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I believe that the answer is 2) trains, but if you are allowed to have multiple answers I would say put 1) trucks and 2) trains
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The anti-slavery movement grew from peaceful origins after the American Revolution to a Civil War, or War Between the States, that effectively ended slavery while severely damaging the women's rights movement. ... The women's rights movement was the offspring of abolition. Many people actively supported both reforms
The Huang He, or Yellow river was very important in Ancient Chinese society. It's called the yellow river because of the huge amount of silt inside of it flowing down. Because of this, the soil around it was very fertile, and this was great for rice farmers.
The Indus River Valley civilization relied on the Indus River because it provides a source of water, travel, and irrigation for crops, as well as very fertile soil.
Hope this helps
