What peace treaty officially ended World War I in 1919?

The Treaty of Versailles was the 1919 peace treaty that officially ended World War I between Germany and most of the Allied Powers.

The treaty was signed on 28 June 1919 in the Hall of Mirrors at the Palace of Versailles, exactly five years after the assassination of Archduke Franz Ferdinand. It required Germany to accept responsibility for the war, pay reparations, surrender territory, reduce its armed forces, and give up its overseas colonies.

The armistice of 11 November 1918 had stopped the fighting, but it was not the final peace settlement. The Treaty of Versailles, which entered into force on 10 January 1920, formally ended the state of war between Germany and the principal Allied powers. Germany’s former allies signed separate treaties, including Saint-Germain, Trianon, and Neuilly.

A common oversimplification is saying Versailles ended every legal aspect of World War I by itself. It was the central treaty of the postwar settlement, and it is the canonical answer to this quiz question, but several related peace treaties completed the wider settlement.