Well, it is like the Biblical story about the Tower of Babylon - in the beginning, there was only one language and all the people in the world spoke it. However, because of many disputes and quarrels, they all separated and created numerous new languages. The same thing happened in the real world (if you don't believe in what the Bible says) - there used to be Proto-Indo-European language, but over time, it developed many new languages as people grew apart and created new nations.
Answer:
Guilt was assigned to Germany as they caused the most deaths in the war. However, this is somewhat incorrect, because Austria-Hungary caused the war, not Germany.
Explanation:
The Germans had to give up land.
The Polish Corridor split Germany in 2.
It had to pay a massive amount of debt to the allies.
The military was reduced to 100,000 men, no airforce.
The Rhineland was demilitarized.