Covalent compounds can be subdivided into polar and no polar compounds. In water, a polar molecule, the hydrogen electrons are not shared equally with the oxygen atoms; this results in a polar bond. Oxygen due to it's greater electro negativity pulls the electrons closer to its nucleus.
The Treaty of Versailles was the main causes of World War II due to the following reasons,Germany had to pay back 33 billion after WWI and forced to accept sole blame for the war in order to justify the reparations.
The Germans thought this was unfair, because other nations were given self-determination  but many Germans LOST the right to be part of Germany. The main reasons why the Germans hated the Treaty of Versailles was because they thought it was unfair. Germany had not taken part in the Conference. The terms were imposed upon Germany  when Germany disagreed, the Allies threatened to go to war again.