Possibly because they wanted credit in the eyes of the colonists
If you are asking what 9/11 was about, it was the day when the twin towers got hit by 2 planes, and was stated as a terroist attack.
1. Full disarming. Germany basically agreed to have no standing army whatsoever.
2. Germany lost over half of it's territory in the treaty.
3. Germany had to pay A LOT of money in damages + interest.
