This map, published by National Geographic in 1920, shows the territorial changes in Europe brought about by World War I and agreed at the Paris Peace Conference of 1919. As indicated in the key on the lower left of the map, different colored lines are used to show new political boundaries as definitely decided, new political boundaries as yet undecided, territories subject to plebiscite, international territories, and the boundaries of countries as they existed before the war. The war and the subsequent peacemaking process resulted in the return to France of the provinces of Alsace and Lorraine (lost to Germany in the Franco-Prussian War of 1870–71); the transfer of small amounts of territory from Germany to Belgium and Denmark; the establishment of an independent Polish state out of territories previously part of the German, Russian, and Austro-Hungarian empires; the breakup of Austria-Hungary and the establishment of the independent states of Austria, Hungary, and Czechoslovakia; and the establishment of a South Slav state (Yugoslavia) that united the Kingdom of Serbia and territories formerly part of the Austro-Hungarian Empire. Other changes included the establishment of the free city of Danzig (present-day Gdansk, Poland), and the transfer of the Trentino region from Austria to Italy. As shown on the map, the situation in Eastern Europe was still highly unsettled. The newly established states of Latvia, Lithuania, and Estonia are indicated, but their borders and those of Poland with Russia (soon to become the Soviet Union) are shown as still undecided. Some of these political and territorial changes persist to the present day. Others proved to be unstable and were undone in the 1930s or in World War II, or as recently as the 1990s, which saw the breakup the Czechoslovakia, the Soviet Union, and Yugoslavia. An inset map shows the Dardanelles in detail. Scale is indicated in kilometers and miles. The map is part of the collection made by General Tasker Howard Bliss (1853–1930) during his service with the United States Army in World War I and at the Paris Peace Conference of 1919.