Why did the paris peace conference negotiations last over a year?

The Paris Peace Conference and the Treaty of Versailles

Negotiations at the Paris Peace Conference were not always easy. Great Britain, France, and Italy fought together during the First World War as Allied Powers. The United States, entered the war in April 1917 as an Associated Power, and while it fought on the side of the Allies, it was not bound to honor pre-existing agreements between the Allied powers. These agreements tended to focus on postwar redistribution of territories. U.S. President Woodrow Wilson strongly opposed many of these arrangements, including Italian demands on the Adriatic. This often led to significant disagreements among the "Big Four."  

Senate opposition to the Treaty of Versailles cited Article 10 of the treaty, which dealt with collective security and the League of Nations. This article, opponents argued, ceded the war powers of the U.S. Government to the League's Council. The opposition came from two groups: the "Irreconcilables," who refused to join the League of Nations under any circumstances, and "Reservationists," led by Senate Foreign Relations Committee Chairman, Henry Cabot Lodge, who were willing to ratify the treaty with amendments. While Lodge was defeated in his attempt to pass amendments to the Treaty in September, he did manage to attach 14 "reservations" to it in November. In a final vote on March 19, 1920, the Treaty of Versailles fell short of ratification by seven votes. Consequently, the U.S. Government signed the Treaty of Berlin on August 25, 1921. This was a separate peace treaty with Germany that stipulated that the United States would enjoy all "rights, privileges, indemnities, reparations or advantages" conferred to it by the Treaty of Versailles, but left out any mention of the League of Nations, which the United States never joined.

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what started the norman conquest?

profound political, administrative, and social changes in the british isles. last line of my information: )