Answer:
present-day Arizona, California, western Colorado, Nevada, New Mexico, Texas, and Utah
Explanation:
525,000 square miles of land that include those states
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.
Answer:
1) New and revolucionary tactics and weapons (european powers use the inspirations in WWI)
2) Number of fallen remains far higher than in any other american war before or after
3) That is was war to prevent seccesion of Southern states and breaking of USA
