<span>They wanted to expand their empires by acquiring more land. </span>
Mexico wouldn't negotiate.
Manifest Destiny.
Pacific Port.
There is many more but these are the ones I remember
Answer:
The machine gun, had been so refined that they changed the nature of warfare. Tanks and airplanes had a big impact on mechanized warfare, or warfare that relies on machines powered by gasoline and diesel engines.
Explanation:
