Because there were messages intercepted from Germany to Mexico, telling Mexico to join the war and attack the United States. I hope this helps :)
Many european nations and america desired to expand their "spheres of influence" and control parts of China for their own 'empire', which enables the nations to get more resources and other 'exotic' things that they do not have in their native lands.
Answer:
The most devastating impact of the Great Depression was human suffering. In a short period of time, world output and standards of living dropped precipitously. As much as one-fourth of the labour force in industrialized countries was unable to find work in the early 1930s.
Explanation:
In the American Revolution, privateers transported arms, munitions and tropical products to the American continent. ... Following the American Revolution, many former privateers became captains on merchant ships, because without war, privateering was no longer needed on such a large scale.
