The Treaty of Versailles is known to be the official end to World War I, but is also known for being very harsh on Germany. United States President Woodrow Wilson actually didn't even want the Treaty of Versailles, but other countries felt as if Germany should take the whole blame for the war and pay for what they did.
One of the key points of the Treaty of Versailles was stripping Germany of its overseas colonies, along with a lot of its army. They also had to pay reparations, which this along with the already bad German economy, caused many people to suffer. One of the biggest key points that the Treaty of Versailles required was for Germany to take the whole blame for World War I.
Germany did not feel as if they should have the whole blame for World War I, as many countries were involved. They thought they had as much to do with the war as anybody else, so many people did not want their country to take the blame for it. This caused deep resentment in the German people, along with resentment within Adolf Hitler.