Before World War 1 countries were forming alliances. Britain
and France were allied with Serbia and German and Russia were allied with Austria-Hungary. When Archduke Ferdinand was assasinated all these countries were brought into a "local" war between Serbia and Austria-Hungary. Hope this helps!
now i’ve watched a Miracle on Ice before, so i’ll answer the first question:
the reason why they needed the win was because it was a way to uplift hope and set aside the differences between them. this was also a meaningful victory to many Americans
The last two are correct.
I think it’s because they have good farm land