Answer:
The territorial changes in Europe after World War I were significant and resulted in the redrawing of national boundaries and the creation of new countries. Some of the key territorial changes in Europe after World War I include:
Dissolution of empires: The Austro-Hungarian Empire and the Ottoman Empire, which were major powers in Europe prior to World War I, were dissolved. This led to the creation of several new countries in Central and Eastern Europe, such as Austria, Hungary, Czechoslovakia, and Yugoslavia.
Loss of territory by defeated powers: Germany and its allies, which were defeated in World War I, lost significant territories as part of the peace settlements. The Treaty of Versailles, which was signed in 1919, imposed territorial changes on Germany, including the loss of territories to France, Poland, Denmark, and Belgium, as well as the return of territories to other countries such as Czechoslovakia and Lithuania.
Creation of new states: Several new countries were created after World War I, including Poland, which was reestablished as an independent state after being divided among neighboring powers for over a century. Other new states included Estonia, Latvia, and Lithuania, which gained independence from Russia, and Finland, which gained independence from Russia as well.
Redrawing of national boundaries: The national boundaries of several countries in Europe were redrawn after World War I, often based on ethnic, cultural, or historical considerations. For example, the borders of Poland, Czechoslovakia, and Yugoslavia were redrawn to include areas with significant populations of their respective ethnic groups.
League of Nations mandates: As part of the peace settlements after World War I, some territories were placed under League of Nations mandates. These territories were previously part of the German and Ottoman Empires and were administered by other countries on behalf of the League of Nations. Examples of such territories include the Saar Basin, Danzig (now Gdansk), and various territories in the Middle East.
These are some of the main territorial changes in Europe after World War I. The redrawing of national boundaries and the creation of new countries had significant political, social, and economic impacts, and many of these changes continue to shape the geopolitical landscape of Europe to this day.