Historical biography archive · Updated 2026-11-03

Harry S Truman Biography and Timeline

Follow Harry S Truman through 151 dated historical records for United States of America.

Harry S Truman, historical timeline

A chronological timeline drawn from matching World History Database records.

151Distinct records
1 of 4Page
1884–1945Years on this page

1884

Birth of Harry S Truman

Politics / Republican Party

Birth of Harry S Truman

1945

President of USA

President of USA · Government / Republican Party Government

Appointed President of the USA, 33rd President, 1st term

Role range: 1945-1953 – 1945-1953

First Manhattan Project Briefing

Washington · Warfare / Nuclear

Truman learns of the secret atomic-bomb development programme from Secretary of War Henry Stimson shortly after becoming president.

VE Day

President of USA · Washington · Warfare / World War, 2nd

The day that marks victory in Europe for the Allies in World War II, the defining events were the Germans unconditional surrender Eisenhower at Rheims, France, and to the Soviets in Berlin on May 7, President Truman announces victory at 9 AM. Makes the announcement of Allied victory over the Axis powers in Europe at 3 PM

Role range: 1939-1945 – 1945-1953

Rule of Germany

President of USA · Warfare / World War, 2nd

USA., Britain, Russia & France declare supreme authority over Germany

Role range: 1939-1945 – 1945-1953

Charter

President of USA · Government / Republican Party Government

Witnesses the signing of the charter of the United Nations

Role range: 1945-1953 – 1945-1953

United Nations

President of USA · Government / Republican Party Government

Witnesses the signing of the charter of the United Nations. Calls the United Nations "a great instrument for peace & security & human progress in the world"

Role range: 1945-1953 – 1945-1953

Charter

President of USA · Warfare / United Nations

Witnesses the signing of the charter of the United Nations

Role range: 1945-1953

Operation Downfall

President of USA · Warfare / World War, 2nd

The Allies prepare for the land invasion of Japan, the plan is scrapped

Role range: 1939-1945 – 1945-1953

Manhattan Project

President of USA · Warfare / Nuclear

General Carl Spaatz is ordered to bomb one of the targets: Hiroshima, Kokura, Niigata, or Nagasaki as soon as weather permitted, some time after August 3

Role range: 1939-1945 – 1945-1953

Trinity Nuclear Test

President of United States of America · President of USA · New Mexico · Warfare / Nuclear

The United States conducts the Trinity test, the first detonation of a nuclear explosive device.

Role range: 1945-1953

Bombing of Japan

President of USA · Warfare / World War, 2nd

General Carl Spaatz is ordered to bomb one of the targets: Hiroshima, Kokura, Niigata, or Nagasaki as soon as weather permitted, some time after August 3

Role range: 1939-1945 – 1945-1953

Invention of Atomic Bomb

President of USA · Berlin · Warfare / World War, 2nd

With Allied leaders in Potsdam when he hears news of the succesful test explosion

Role range: 1939-1945 – 1945-1953

Manhattan Project

President of USA · Warfare / World War, 2nd

General Carl Spaatz is ordered to bomb one of the targets: Hiroshima, Kokura, Niigata, or Nagasaki as soon as weather permitted, some time after August 3

Role range: 1939-1945 – 1945-1953

Conference of Potsdam

President of USA · Potsdam · Warfare / World War, 2nd

Soviet power in Eastern Europe is recognized. Polands western frontier will follow the Oder-Neisse line. Germany will divided into 4 zones. Churchill, Stalin & Truman agree the map for post war Europe

Role range: 1939-1945 – 1945-1953

first Atomic weapons

President of USA · Warfare / Nuclear

President Harry S. Truman discloses to Soviet leader Joseph Stalin that the United States has atomic weapons, Stalin feigns little surprise; he already knows this through espionage

Role range: 1945-1953

1st Atomic Weapons

President of USA · Warfare / World War, 2nd

President Harry S. Truman discloses to Soviet leader Joseph Stalin that the United States has atomic weapons, Stalin feigns little surprise; he already knows this through espionage

Role range: 1945-1953 – 1945-1953

Bombing of Hiroshima

President of USA · Hiroshima · Warfare / World War, 2nd

Decides to drop the A-bomb on Hiroshima

Role range: 1939-1945 – 1945-1953

Declaration of Potsdam

President of USA · Potsdam · Warfare / World War, 2nd

USA, Britain & Nationalist China calls for unconditional Japanese surrender. The US, Britain & Nationalist China calls for unconditional Japanese surrender

Role range: 1939-1945 – 1945-1953

Manhattan Project

President of USA · Warfare / World War, 2nd

President Harry S. Truman discloses to Soviet leader Joseph Stalin that the United States has atomic weapons, Stalin feigns little surprise; he already knows this through espionage

Role range: 1945-1953 – 1945-1953

Ultimatum-Potsdam

President of USA · Potsdam · Warfare / World War, 2nd

The Japanese have to choose "utter devastation or unconditional surrender"

Role range: 1939-1945 – 1945-1953

Bretton Woods Agreements Act

President of USA · Washington · Government / Democratic Party Government

Truman signs legislation authorising United States participation in the IMF and World Bank, implementing the institutions supporting the new dollar-gold monetary order.

Role range: 1945-1953

Bombing of Hiroshima

President of USA · Hiroshima · Warfare / World War, 2nd

"Little Boy" is loaded onto the Enola Gay

Role range: 1939-1945 – 1945-1953

Hiroshima Atomic Bombing

President of United States of America · President of USA · Hiroshima · Warfare / Nuclear

The United States drops an atomic bomb on Hiroshima, the first wartime use of a nuclear weapon.

Role range: 1945-1953

Manhattan Project

President of USA · Nagasaki · Warfare / Nuclear

"Fat Man", an implosion-type plutonium-239 weapon, is used against the city of Nagasaki, Japan

Role range: 1939-1945 – 1945-1953

Nagasaki Atomic Bombing

President of United States of America · President of USA · Nagasaki · Warfare / Nuclear

The United States drops a second atomic bomb on Nagasaki three days after Hiroshima.

Role range: 1945-1953

Bombing of Nagasaki

President of USA · Nagasaki · Warfare / World War, 2nd

The USA drops the atomic bomb on Nagasaki

Role range: 1939-1945 – 1945-1953

Further Atomic Bombing Halted

Washington · Warfare / Nuclear

Truman orders that no additional atomic bombs be used without further presidential authority.

Smyth Report

President of USA · Science / Physics

The Smyth Report is released to the public, giving the first technical history of the development of the first atomic bombs

Role range: 1945-1953

Smyth Report

President of USA · Warfare / Nuclear

The Smyth Report was the common name given to an administrative history written by physicist Henry DeWolf Smyth about the Allied World War II effort to develop the atomic bomb, the Manhattan Project. The Smyth Report is released to the public, giving the first technical history of the development of the first atomic bombs

Role range: 1945-1953

Manhattan Project

President of USA · Warfare / World War, 2nd

The Smyth Report is released to the public, giving the first technical history of the development of the first atomic bombs

Role range: 1939-1945 – 1945-1953

Smyth Report

President of USA · Warfare / World War, 2nd

The Smyth Report is released to the public, giving the first technical history of the development of the first atomic bombs

Role range: 1939-1945 – 1945-1953

Result of Surrender of Japan

President of USA · Government / Republican Party Government

The United States announces Japan's unconditional surrender and the end of major Pacific hostilities.

Role range: 1945-1953 – 1945-1953

Surrender of Japan

President of USA · Government / Republican Party Government

Announces the unconditional surrender of Japan

Role range: 1945-1953 – 1945-1953

Bombing of Nagasaki

President of USA · Nagasaki · Warfare / World War, 2nd

"Fat Man", an implosion-type plutonium-239 weapon, is used against the city of Nagasaki, Japan

Role range: 1939-1945 – 1945-1953

Fat Man

President of USA · Nagasaki · Warfare / World War, 2nd

"Fat Man", an implosion-type plutonium-239 weapon, is used against the city of Nagasaki, Japan

Role range: 1939-1945 – 1945-1953

Manhattan Project

President of USA · Nagasaki · Warfare / World War, 2nd

"Fat Man", an implosion-type plutonium-239 weapon, is used against the city of Nagasaki, Japan

Role range: 1939-1945 – 1945-1953

Invasion of Korea

President of USA · Government / Republican Party Government

By the end of the yr 50,000 marines are in Korea

Role range: 1945-1953 – 1945-1953

Mobilization

President of USA · Government / Republican Party Government

By the end of the yr 50,000 marines are in Korea

Role range: 1945-1953 – 1945-1953

Naval Base

President of USA · Tsingtao · Government / Republican Party Government

The US establishes a naval base at Tsingtao

Role range: 1945-1953 – 1945-1953

Records, sources and methodology

These dates and descriptions come from the historical_events database. Exact duplicate records have been collapsed. Names are grouped by the country, Name 2 and Name 1 fields; records with missing Name 2 cannot be reliably assigned to an individual biography. Check the underlying sources before formal citation.