The Treaty of Versailles was one of several treaties that came out of peace negotiations in Paris in January 1919. Under the treaty, Germany was forced to give up, and return, specific territories in Europe, Asia, and Africa. The treaty also contained a 'war guilt clause' which gave Germany all the blame for the war and required repayment for all civilian damages. The Treaty of Versailles was signed by German representatives on June 28, 1919 and caused tensions within Germany.
McKay, John "A History of Western Europe" pgs 859-860