World War II

World War II was a global conflict that lasted from 1939 to 1945. It involved many of the world’s major powers, divided into two opposing military alliances: the Allies (led by the United States, the United Kingdom, and the Soviet Union) and the Axis (led by Germany, Japan, and Italy). In this lesson, we will explore the basic concepts of World War II, its history, and its impact on the world.

Causes of World War II

There were many complex factors that led to the outbreak of World War II, including:

Treaty of Versailles – the harsh treatment of Germany in the Treaty of Versailles, which ended World War I, led to resentment and a desire for revenge.

Appeasement – the policy of appeasement, pursued by Britain and France, allowed Germany to rearm and expand its territories without opposition.

Expansionist policies – the aggressive expansionist policies of Japan, Italy, and Germany, which led to the invasion of China, Ethiopia, and other countries.

Key Events of World War II

World War II was marked by many significant events, including:

Invasion of Poland – on September 1, 1939, Germany invaded Poland, marking the official start of the war.

Pearl Harbor – on December 7, 1941, Japan launched a surprise attack on the United States naval base at Pearl Harbor, drawing the United States into the war.

D-Day – on June 6, 1944, the Allies launched a massive invasion of Normandy, France, which became a turning point in the war.

Atomic bombings of Hiroshima and Nagasaki – on August 6 and 9, 1945, the United States dropped atomic bombs on the Japanese cities of Hiroshima and Nagasaki, leading to Japan’s surrender and the end of the war.


World War II had a profound impact on the world, with its consequences felt for decades to come. Some of the most significant impacts include:

Death and destruction – World War II was the deadliest conflict in human history, with an estimated 70 million fatalities.

Formation of the United Nations – the United Nations was formed in 1945, with the goal of preventing future global conflicts.

Cold War – the tensions between the United States and the Soviet Union that emerged after World War II led to the Cold War, which dominated world politics for much of the 20th century.

World War I

The Cold War