Some causes of nations joining world war 1
- Assassination of Archduke Franz Ferdinand
- Military rivalry between powerful nations
- US: the Zimmermann Telegram and the sinking of the Lusitania
- Colonies: The wish that if they fought for for their European countries they could be free, and so they join the war, making it a World War effectively
hope this helps
Answer:
I would say the last one because it authorized the president to take measures to promote peace and security in Asia
Mountainous? I remember one part of Korea being that way.
Expand in what? if you elaborate i could help!