7 Most Important Leaders of WWII

World War II (WWII) was a global conflict that involved many nations and leaders, each playing a crucial role in shaping the course of history. The war spanned from 1939 to 1945, and its impact was profound, leading to significant geopolitical changes and the emergence of new world powers.

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In this detailed exploration, WHE team of historians present the lives and contributions of seven of the most important leaders during World War II.

Adolf Hitler (Germany)

Hitler’s military strategies, particularly the use of Blitzkrieg tactics (swift and coordinated attacks), allowed German forces to achieve rapid territorial gains in the early stages of the war.

Adolf Hitler, born in Austria in 1889, rose to prominence as the leader of the National Socialist German Workers’ Party (Nazi Party). He became Chancellor of Germany in 1933 and later assumed dictatorial powers, consolidating his control over the German government.

Major events that facilitated Adolf Hitler’s rise to power

Role in WWII: Hitler’s aggressive foreign policies, including the invasion of Poland in 1939, triggered the start of World War II. He aimed for territorial expansion, dominance in Europe, and the establishment of a racially motivated Nazi empire. Hitler’s military strategies and leadership style had a profound impact on the early stages of the war.

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Major Actions:

  • Invasion of Poland (1939): Hitler’s invasion of Poland marked the beginning of WWII, prompting Britain and France to declare war on Germany.
  • Blitzkrieg Tactics: Hitler’s military strategy relied heavily on Blitzkrieg, or “lightning war,” characterized by rapid and overwhelming attacks using combined forces of infantry, tanks, and air support.
  • Invasion of France (1940): Germany’s rapid conquest of France showcased Hitler’s military prowess, and the fall of France led to a significant shift in the balance of power.


  • Eastern Front and Stalingrad (1941-1942): Hitler’s decision to invade the Soviet Union led to a prolonged and brutal conflict on the Eastern Front. The Battle of Stalingrad (1942-1943) became a turning point, as German forces suffered a decisive defeat.
  • Deteriorating Military Situation: As the war progressed, strategic mistakes, the entry of the United States into the conflict, and the overwhelming Allied forces led to Germany’s military decline.
  • End of the Third Reich: Facing imminent defeat, Hitler committed suicide in his bunker in Berlin on April 30, 1945, marking the end of the Third Reich.

Legacy: Hitler’s legacy is one of infamy, as his aggressive expansionist policies and genocidal actions, particularly the Holocaust, resulted in the deaths of millions. He remains a symbol of tyranny and the consequences of unchecked authoritarianism.

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Sir Winston Churchill (United Kingdom)

A 1904 image of Churchill. His steadfast leadership and eloquent speeches made him an iconic figure in British and global history, symbolizing resilience in the face of adversity.

Winston Churchill, born in 1874, had a long and distinguished career in British politics. He served as a military officer, journalist, and statesman before becoming Prime Minister.

Role in WWII:Churchill assumed the role of Prime Minister of the United Kingdom on May 10, 1940, at a critical juncture in WWII. His leadership during the war was characterized by resolute determination, eloquent speeches, and a commitment to Allied victory.

Major Actions:

  • Battle of Britain (1940): Churchill’s inspirational speeches during the Battle of Britain, when the Royal Air Force successfully defended against German air attacks, bolstered British morale.
  • North African Campaign: Churchill played a crucial role in the North African theater, where British forces, led by General Montgomery, achieved significant victories against Axis powers.
  • Strategic Planning: Churchill was actively involved in strategic planning with Allied leaders, including U.S. President Franklin D. Roosevelt and Soviet Premier Joseph Stalin.

Contribution to the Allies:

  • Lend-Lease Agreement: Churchill negotiated the Lend-Lease Agreement with the United States, providing crucial support to the British war effort by supplying arms and resources.
  • Symbol of Resistance: Churchill’s speeches, including the famous “We shall fight on the beaches” address, transformed him into a symbol of British and Allied resistance against Nazi aggression.

Post-War Era:

  • Iron Curtain Speech (1946): Churchill delivered his famous Iron Curtain speech, warning of the Soviet Union’s growing influence and the division of Europe into East and West.
  • Nobel Prize: In 1953, Churchill was awarded the Nobel Prize in Literature for his mastery of historical and biographical description, as well as for brilliant oratory.

Legacy: Churchill’s leadership during WWII solidified his place in history as a statesman of unparalleled resolve. His legacy extends beyond the war, encompassing his contributions to post-war reconstruction and the early years of the Cold War.

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Franklin D. Roosevelt (United States)

A 1913 image of Franklin D. Roosevelt. The attack on Pearl Harbor in 1941 prompted the United States to enter the war. Roosevelt’s leadership during this period was marked by a commitment to total victory against the Axis powers.

Franklin Delano Roosevelt (FDR), born in 1882, served as the 32nd President of the United States. Elected in 1932, he faced the challenges of the Great Depression and later led the nation through World War II.

Role in WWII: FDR’s presidency spanned the majority of WWII, and he played a pivotal role in shaping U.S. foreign policy, diplomatic efforts, and military strategy.

Major Actions:

  • Lend-Lease Act (1941): FDR initiated the Lend-Lease Act, allowing the United States to provide material support to Allied nations without direct involvement in the conflict.
  • Pearl Harbor and Entry into the War (1941): The Japanese attack on Pearl Harbor on December 7, 1941, led to the U.S. entry into WWII. FDR addressed the nation, declaring December 7th as “a date which will live in infamy.”

Global Diplomacy:

  • Casablanca Conference (1943): FDR, along with Churchill, discussed Allied strategy in North Africa during the Casablanca Conference. The Allies affirmed their commitment to unconditional surrender from the Axis powers.
  • Tehran Conference (1943): FDR, Churchill, and Stalin met in Tehran to coordinate Allied strategy and discuss post-war planning.

Domestic Policies:

  • War Production Board: FDR implemented measures to mobilize the U.S. economy for war, including the establishment of the War Production Board to oversee wartime industrial production.
  • Internment of Japanese Americans: FDR signed Executive Order 9066, leading to the internment of Japanese Americans during the war, a controversial and regrettable episode in American history.

Post-War Vision:

  • United Nations:FDR played a key role in the creation of the United Nations, envisioning it as an international forum for diplomacy and conflict resolution.

Legacy: FDR’s legacy is complex, shaped by his leadership during the Great Depression and World War II. While admired for his domestic policies and global diplomacy, his internment of Japanese Americans remains a dark chapter. FDR’s leadership laid the groundwork for the United States’ emergence as a superpower.

Joseph Stalin (Soviet Union)

Stalin’s leadership during key battles on the Eastern Front, such as the Battle of Stalingrad and the Siege of Leningrad, contributed to the Soviet Union’s ability to repel German forces and push them back.

Joseph Stalin, born in 1878, emerged as the leader of the Soviet Union after the death of Vladimir Lenin. He led the Soviet Union from the mid-1920s until his death in 1953.

Role in WWII: Stalin played a crucial role in the Eastern Front of WWII, leading the Soviet Union against the German invasion and contributing significantly to the defeat of the Axis powers.

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Major Actions:

  • Nazi-Soviet Non-Aggression Pact (1939): Stalin’s pact with Hitler provided a temporary alliance and allowed the Soviet Union to expand its influence in Eastern Europe before the German invasion.
  • Operation Barbarossa (1941): The German invasion of the Soviet Union marked a turning point in the war. Stalin’s leadership during the defense of Stalingrad and the subsequent counteroffensive at Kursk was instrumental in halting the German advance.

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Totalitarian Policies:

  • Purges and Repression: Stalin’s domestic policies included purges, mass executions, and political repression. The Great Purge in the late 1930s targeted perceived enemies of the state, resulting in widespread persecution and loss of life.
  • Collectivization: Stalin implemented policies of forced collectivization, leading to significant social and economic upheaval in rural areas.

Post-War Era:

  • Yalta Conference (1945): Stalin, along with Churchill and FDR, participated in the Yalta Conference to discuss post-war Europe and plan the division of Germany.
  • Iron Curtain: Stalin’s policies contributed to the division of Europe into Eastern and Western blocs, symbolized by Churchill’s “Iron Curtain” speech.

Hideki Tojo (Japan)

Tojo’s legacy is one of militarism and aggression. His role in planning the attack on Pearl Harbor and his leadership during Japan’s expansionist phase had profound consequences, contributing to Japan’s eventual defeat and occupation by Allied forces.

Background and Military Career: Hideki Tojo, born in 1884, was a general in the Imperial Japanese Army and served as Prime Minister of Japan during WWII. He played a key role in shaping Japan’s militaristic policies.

Role in WWII: Tojo served as Prime Minister from 1941 to 1944 and was a driving force behind Japan’s aggressive expansion in Asia and the Pacific.

Major Actions:

  • Attack on Pearl Harbor (1941): Tojo was instrumental in planning the surprise attack on Pearl Harbor, which aimed to neutralize the U.S. Pacific Fleet and expand Japanese influence in the Pacific.
  • Expansion in Southeast Asia: Tojo’s government pursued an aggressive campaign of territorial expansion in Southeast Asia, occupying territories such as the Philippines, Singapore, and Burma.

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  • Military Setbacks: Japan faced significant military setbacks in the latter part of the war, including defeats in battles like Midway and Guadalcanal.
  • Loss of Support: Tojo’s government lost public support as Japan suffered military losses, economic hardships, and increased bombing raids.

Post-War Trials:

  • War Crimes Trials: Tojo was arrested after Japan’s surrender in 1945 and faced trial for war crimes. He was found guilty of crimes against peace, war crimes, and crimes against humanity.
  • Execution: Tojo was executed by hanging in 1948. His trial and execution were part of the broader post-war justice process aimed at holding individuals accountable for war crimes.

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Chiang Kai-shek (China)

An image of Chiang in the early 1940s.

Background and Nationalist Leader: Chiang Kai-shek, born in 1887, was a Chinese military and political leader who played a central role in the Republic of China. He led the Nationalist government and the Chinese Nationalist Party (Kuomintang).

Role in WWII: Chiang Kai-shek was a key figure in the Chinese resistance against Japanese aggression during WWII. His leadership during this period was marked by challenges from both external invaders and internal political struggles.

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Major Actions:

  • Second Sino-Japanese War (1937-1945): Chiang Kai-shek led China’s resistance against Japanese invasion, often with limited resources and support. The conflict, part of the broader WWII, was characterized by brutal battles and occupation of Chinese territories.
  • Alliance with Allies: Chiang sought support from Allied powers, including the United States, in the fight against Japan.

Challenges and Struggles:

  • Internal Struggles: Chiang faced internal challenges, including political rivalries and conflicts with Communist forces led by Mao Zedong. The Chinese Civil War resumed after WWII and eventually led to the establishment of the People’s Republic of China.

Post-War Era:

  • Retreat to Taiwan: Following the Chinese Civil War, Chiang and the Nationalist forces retreated to the island of Taiwan, where he continued to lead the Republic of China until his death in 1975.

Charles de Gaulle (Free France)

Charles de Gaulle’s leadership symbolized French resilience and contributed to the restoration of France’s role as a significant player on the world stage.

Charles de Gaulle, the leader of Free France, played a crucial role in rallying French forces against the Axis powers after the fall of France in 1940. His leadership and determination contributed to the establishment of the Free French Forces.

Contributions and Impact:

  • Free French Forces: De Gaulle formed the Free French Forces, consisting of French troops who chose to continue the fight against Nazi Germany after the fall of France. He became the voice of the Free French movement and a symbol of resistance.
  • Liberation of Paris: De Gaulle played a significant role in the liberation of Paris in 1944. His presence during the victory celebrations underscored the restoration of French sovereignty.
  • Post-War Influence: After the war, de Gaulle continued to be a prominent figure in French politics, serving as the President of the French Republic and playing a key role in the early years of post-war European reconstruction.

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The legacies of these leaders, whether positive or negative, continue to resonate in the historical narratives and collective memories of nations affected by WWII. The war’s conclusion marked a transformative period, ushering in a new world order and setting the stage for the post-war era.

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