The correct answer is the following.
The correct matches are:
Large areas of Europe were in ruins. World War II.
Rising tide of immigration. World War I.
Sustained economic growth. World War II.
German militarism. World War I.
Both World Wars had devastating consequences for the countries that participated. World War 1 raised the number of immigration to different parts of Europe. The Entente Alliance formed by Britain, Russia, and France, and the Triple Alliance formed by Germany, Italy, and Austria-Hungary, provoked severe damage in the European territory. The German militarism showed its power and was difficult for the Entente Alliance to win the war and punish Germany.
World War II was even more destructive than World War I. New war machines, air raids, and powerful armies destroyed many placed in Europe. Large areas in Europe were in ruins. That is why the United States designed the Marshall plan after the world in order to help the reconstruction of the European cities that were destroyed.