World Wars, the Cold War, and European Cooperation
Students trace the causes and consequences of major twentieth-century conflicts and consider why European nations later created institutions for cooperation.
Illustrations are auto-generated and may be placeholders. They can be refreshed to match the narration.
Nationalism and the First World War
By the early 1900s, European powers competed for territory, military strength, and influence. Nationalism encouraged strong loyalty to one’s nation but also increased tensions among ethnic groups and rival states. European countries formed alliances that promised military support. In 1914, the assassination of Archduke Franz Ferdinand of Austria-Hungary set off a chain of declarations of war. Alliance systems turned a regional dispute into World War I. Soldiers fought with machine guns, heavy artillery, poison gas, and other industrial weapons. On the Western Front, trench warfare caused enormous losses while armies gained little territory. For example, soldiers might spend weeks in muddy trenches separated from the enemy by barbed wire and dangerous open ground. The war ended in 1918 after millions of military and civilian deaths.
Unstable Peace and the Rise of Dictators
The peace settlement after World War I redrew borders and required Germany to accept harsh penalties. Economic hardship, political conflict, and resentment weakened several European democracies. The worldwide Great Depression, beginning in 1929, caused unemployment and poverty. Dictators promised order, national strength, and quick solutions. Benito Mussolini established a fascist government in Italy, Adolf Hitler and the Nazi Party took control of Germany, and Joseph Stalin ruled the Soviet Union through a communist dictatorship. These governments restricted speech, used propaganda, and punished opponents. For example, the Nazis organized rallies and controlled schools and media to promote loyalty to Hitler and racist ideas. Dictatorship grew not from a single cause but from a combination of economic fear, political instability, nationalism, prejudice, and the destruction of democratic safeguards.
World War II and the Holocaust
World War II began in Europe in 1939 when Germany invaded Poland. Germany and its partners formed the Axis powers, while Britain, the Soviet Union, the United States, and other nations became the Allies. The conflict spread across Europe, Africa, Asia, and the oceans. Civilians faced bombing, occupation, hunger, and forced migration. Nazi Germany also carried out the Holocaust, the systematic persecution and murder of six million Jewish people and millions of other victims. People were stripped of rights, forced into ghettos and camps, and killed in mass shootings and extermination centers. For example, the Warsaw Ghetto confined Jewish families behind walls under brutal conditions before many were deported. The Holocaust demonstrates the consequences of antisemitism, dehumanization, dictatorship, and public institutions being used to carry out persecution.
Cold War Division and European Cooperation
After World War II, the United States and Soviet Union emerged as rival superpowers. Their conflict was called the Cold War because they avoided a direct full-scale war against each other, although they competed through alliances, weapons, propaganda, and conflicts in other countries. Europe was divided between democratic western states and communist eastern states. The Berlin Wall, built in 1961, became a symbol of this division because it prevented many East Germans from leaving. Communist governments in Eastern Europe weakened in 1989, and the Soviet Union dissolved in 1991. Meanwhile, European countries developed cooperative institutions to reduce the chance of another major war. The European Union eventually created shared rules and a large common market. Its growth showed how former enemies could cooperate while remaining separate nations.