Woodrow Wilson suffered from strokes, this is believed by a few historians to be the reason as to why some of the 14 points was changed
Since 1879, Austro-Hungary were Germany's biggest allies, but the empire collapsed. Although, Austria was made up of 8 million people, it wasn't allowed to unify with Germany due to the Treaty of Versailles.
Navy down to 15,000
Army down to 100,000
The Rhineland was demilitarised and the Allied troops would occupy it for 15 years
Germany couldn't make poison gas, tanks, aircraft, submarines and ships were limited in their number
Reparations were not fixed in the Treaty of Versailles. In 1921, the Reparations Commission established the sum of 144 billion RM, £6.6billion. Many Germans argued they couldn't afford to pay this off, although this is debated.
War Guilt Clause (Article 231) said that Germany had to take complete guilt for the war