Harry Truman grows up on a Missouri farm and becomes instantly smitten with a girl named Bess Wallace at church.

Captain Truman leads Battery D through the Meuse-Argonne offensive without losing a single soldier.

Truman wins election to the US Senate, with victory widely credited to the Pendergast political machine.

Japan bombs Pearl Harbor, and Truman rushes back to Washington to vote for a declaration of war.

FDR selects Truman as his vice presidential running mate for an unprecedented fourth term.

President Roosevelt collapses and dies at his vacation home in Warm Springs, Georgia.

Truman is sworn in as the 33rd president of the United States, with a horrified Bess standing beside him.

Secretary of War Stimson tells Truman there is a secret military program costing millions but withholds its full details.

General Leslie Groves briefs Truman on the atomic bomb, describing a weapon capable of destroying an entire city.

Germany formally surrenders, and Truman announces the end of the war in Europe.

The first atomic bomb is successfully detonated in a test at Alamogordo, New Mexico.

Truman tells Stalin at the Potsdam Conference that the United States possesses a new weapon of unusual destructive force.

Japan publicly rejects the Potsdam Declaration demanding unconditional surrender.

A B-29 called the Enola Gay drops the atomic bomb on Hiroshima, nearly destroying the entire city.

Japan formally accepts the terms of surrender, ending World War II.

Harry Truman's unlikely journey from Missouri farm boy to president began long before he took office, shaped by military service, Senate work, and an unexpected nomination as FDR's running mate. When Roosevelt died suddenly in April 1945, Truman was thrust into the most powerful office in the world with no preparation and no knowledge of the atomic bomb being developed in secret. Over the following weeks, Stimson and then Groves gradually revealed the magnitude of what awaited him, culminating in a full briefing on a weapon capable of destroying an entire city. Truman guided the Allied powers through Germany's surrender, confronted Stalin at Potsdam, and authorized the use of atomic weapons against Japan. The bombing of Hiroshima and Japan's subsequent surrender marked both the end of World War II and the dawn of a terrifying new age.

The headline story of Truman's sudden rise and America's decisive end to World War II.

A childhood illness forces Truman to spend nearly a year bedridden, reading books about great historical figures.

Truman marries his longtime sweetheart Bess Wallace on the same day the Treaty of Versailles is formally signed.

Truman and his partner Jacobson open a Kansas City haberdashery that collapses during an economic recession.

Tom Pendergast, whose machine helped put Truman in the Senate, is sent to federal prison for tax evasion.

Truman wins a hard-fought Senate primary, securing reelection despite attacks on his ties to the Pendergast machine.

Truman's defense industry oversight committee earns him a cover story in Time magazine as a wartime watchdog.

News of Roosevelt's death reaches Hitler in his bunker, where he takes it as a miraculous sign the war can still be won.

Truman makes his first presidential decision, declaring that the San Francisco United Nations Conference will proceed as planned.

Truman surprises his former Senate colleagues by visiting Capitol Hill on his very first full day as president.

At FDR's funeral, no one rises when Truman enters the room as protocol demands, though all stand for Mrs. Roosevelt.

General Eisenhower halts Allied forces at the Elbe River, choosing not to race the Soviets to Berlin.

Truman hosts the first Potsdam dinner and watches soldiers raise the same American flag that flew over Pearl Harbor.

Churchill loses the British general election, and Clement Atlee arrives at Potsdam to replace him mid-conference.

The US Senate overwhelmingly ratifies the United Nations Charter.

The Soviet Union enters the war against Japan, and a second atomic bomb is dropped on the city of Nagasaki.

Behind the headline events of Truman's presidency lay a series of pivotal secondary moments that built the man who became president. A bedridden childhood instilled his love of reading and self-discipline, while later failures in business and the corrupting influence of the Pendergast machine tested his integrity. Once in office, small but significant moments—from visiting old Senate colleagues to witnessing the solemnity of FDR's funeral—revealed how Truman navigated a wary Washington establishment. On the world stage, events like Eisenhower's decision to halt at the Elbe River and Churchill's stunning electoral defeat reshaped the geopolitical landscape mid-conference at Potsdam. The pool closes with the Soviet entry into the Pacific War and the bombing of Nagasaki, the twin events that sealed Japan's fate and confirmed America's dominance in the emerging postwar order.

The supporting moments and background events that shaped Truman's path and presidency.

Truman's father dies, and Harry abandons his failing oil business to volunteer for the army, seeing war as an escape from failure.

Local political boss Mike Pendergast approaches Truman and offers him a path into politics as a county judge.

Truman receives a call before the Democratic convention saying FDR wants him for vice president; his first reaction is to tell FDR to go to hell.

On election night, Truman plays an impromptu piano concert at a Kansas City hotel and feels the full weight of what is about to happen.

Tom Pendergast dies, and Truman makes the controversial decision to attend the disgraced political boss's funeral.

Truman is drinking whiskey in the Speaker of the House's office when an urgent call arrives summoning him immediately to the White House.

Eleanor Roosevelt informs Truman that FDR has died, telling him that he is now the one in trouble.

Truman holds his first presidential press conference and charms reporters with surprisingly direct, plain-spoken answers.

Truman meets Soviet Foreign Minister Molotov and confronts him bluntly over Soviet violations of the Yalta agreements on Poland.

Churchill warns Truman that an iron curtain has descended across the territories now under Soviet control in Europe.

Truman abruptly cancels the Lend-Lease program, infuriating both Britain and the Soviet Union.

Oppenheimer assembles a committee of scientists to discuss the atomic bomb's use, but the group stops short of questioning whether to use it at all.

Truman signs the United Nations Charter in San Francisco and addresses the founding assembly of fifty nations.

Truman tours the devastated ruins of Berlin and is left philosophical and deeply fearful about the future of mankind.

Japan formally accepts surrender terms, and a crowd gathers outside the White House chanting for Harry Truman.

This pool traces the moments where Truman was forced to make defining choices or had choices thrust upon him against his will. From his father's death pushing him toward military service, to his deeply reluctant acceptance of the vice presidential nomination, Truman repeatedly found himself at crossroads he had never sought. The sudden death of FDR and Eleanor Roosevelt's sobering words set the tone for a presidency defined by hard truths and plain speaking. Confrontations with Molotov, the abrupt end of Lend-Lease, and Churchill's iron curtain warning mark Truman's gradual hardening toward the Soviet Union, even as scientists quietly wrestled with the moral weight of the weapon they were building. The pool closes where the story does, with Japan's surrender and an American public that had come to embrace the man nobody expected to lead them.

The key decisions, discoveries, and emotional shifts that defined Truman's character and presidency.