World War I was a global war fought between the Axis powers (Germany, Austria-Hungary, and Italy) and the Allies (France, Great Britain, and the United States). It engulfed much of Europe and the Middle East, resulting in a mass death of seven to eight million civilians.

After the end of the war, Adolf Hitler came to power in Germany. The Treaty of Versailles forced the country to give up thirteen percent of its European territory and pay enormous reparations. This set the stage for the rise of the Nazi party.

Germans invaded France, Belgium, and Luxembourg. The battles were a grueling three-year front that was filled with atrocities. However, the Allied troops were able to drive the Germans back.

World War II was another great conflict. As the two superpowers, Germany and the Soviet Union, vied for dominance, they resorted to warfare. Eventually, the two blocs formed a League of Nations to prevent further conflicts.

In April 1918, the Royal Air Force was formed. By 1918, American soldiers had also joined the war effort. Some estimates indicate that up to nine to ten million military personnel died during World War I.

After the war, the United States emerged as a rival superpower. Its powerful naval forces were used in major amphibious operations.

After the end of World War I, many countries began to sue for peace. However, the Bolshevik government did not agree to an armistice until the Bolshevik Revolution had taken place in Russia.