The Moments That Almost Broke the Timeline

History often gets presented as an inevitable clean line of cause and effect that leads neatly to the present. But when you look closer, it starts to feel more like a series of narrow escapes and lucky breaks. A storm arrives a day too late, a message fails to get through, someone hesitates for just a second—and the world tilts one way instead of another. These moments don’t always look dramatic at the time. In fact, most of them pass quietly, without anyone realizing how close things came to going very differently. Once you start tracing them, though, it becomes clear how fragile the whole story really is. Here are 20 near-misses in history that could have changed everything.

Archibald Willard on Wikimedia

1. The Cuban Missile Crisis Miscommunication

In 1962, the world edged closer to nuclear war than most people realized at the time. A Soviet submarine, cut off from communication, nearly launched a nuclear torpedo after being harassed by U.S. forces. It didn’t happen largely because one officer, Vasili Arkhipov, refused to agree—an almost invisible act that likely prevented catastrophe.

Don O'Brien on Wikimedia

2. The Assassination Attempt on Hitler That Failed

The July 1944 plot to kill Adolf Hitler came remarkably close to working. The bomb exploded, but a slight shift in where the briefcase was placed shielded him from the full blast.

A few inches in another direction, and the leadership of Nazi Germany could have collapsed from within.

Unknown authorUnknown author on Wikimedia

3. The Apollo 11 Landing Fuel Scare

As Apollo 11 descended toward the Moon, alarms were going off and fuel was running dangerously low. Neil Armstrong had to manually guide the module away from a rocky landing site, touching down with seconds of fuel to spare. A different outcome could have turned a triumph into a tragedy watched worldwide.

NASA / Harrison H. Schmitt on Wikimedia

4. The D-Day Weather Window

The Allied invasion of Normandy depended heavily on a narrow break in terrible weather. If the launch had been delayed even a day or two, German defenses might have been better prepared. That small window helped determine the success of one of the most important operations of World War II.

Chief Photographer's Mate (CPHoM) Robert F. Sargent on Wikimedia

5. The Near Launch of a Nuclear Missile in 1983

A Soviet early-warning system once falsely reported incoming U.S. missiles. Officer Stanislav Petrov chose not to report it as an attack, suspecting a malfunction. If he had followed protocol, the escalation could have been immediate and irreversible.

USSR Post on Wikimedia

6. The Bay of Pigs Air Support That Never Came

The failed invasion of Cuba in 1961 hinged on limited air support that was ultimately scaled back. Without it, the operation unraveled quickly. A slightly different decision might have reshaped U.S.-Cuba relations—and Cold War tensions—entirely.

Miguel Vinas on Wikimedia

7. The Accidental Survival of Queen Elizabeth I

Before becoming queen, Elizabeth I faced imprisonment and serious threats to her life.

A different political turn or a single decisive order could have ended her story early. England’s religious and political trajectory would have shifted in ways that are hard to fully map.

Formerly attributed to Steven van der Meulen / Attributed to George Gower on Wikimedia

8. The Challenger Launch Decision

The Challenger shuttle launched despite concerns about O-ring performance in cold weather. Engineers had raised alarms, but the decision went forward. A delay of even a day might have avoided one of NASA’s most devastating disasters.

NASA image on Wikimedia

9. The Lost Order 191 in World War I

A German battle plan, detailing troop movements, was accidentally dropped and found by Allied forces. That intelligence allowed the Allies to prepare for the coming attack. If it had stayed lost, the outcome of key battles could have shifted dramatically.

Adam Cuerden on Wikimedia

10. The Survival of John F. Kennedy Before 1963

Before his assassination, JFK had already survived multiple close calls, including health crises and earlier threats. Any one of those moments could have altered the political landscape before the 1960s even unfolded. History often forgets how many chances events had to diverge earlier.

U.S. Navy photo on Wikimedia

11. The Gun Jam That Saved Andrew Jackson

During an assassination attempt in 1835, both pistols aimed at President Andrew Jackson misfired. It’s an almost improbable mechanical failure, happening twice in a row. If either gun had worked, the presidency—and American politics—would have shifted immediately.

Mathew Benjamin Brady on Wikimedia

12. The Narrow Escape of the Titanic’s Sister Ship

The RMS Olympic, nearly identical to the Titanic, was involved in multiple serious incidents but avoided disaster.

Those close calls highlighted how easily the Titanic’s fate could have been shared. It wasn’t just bad luck—it was a pattern waiting to happen.

Francis Godolphin Osbourne Stuart on Wikimedia

13. The Almost-Failed Manhattan Project Test

The first nuclear test in 1945 carried real uncertainty about whether it would work—or what exactly it would do. Some scientists worried it might even ignite the atmosphere, however unlikely. The success of that test reshaped global power in an instant.

Jack W. Aeby, July 16, 1945, Civilian worker at Los Alamos laboratory, working under the aegis of the Manhattan Project. on Wikimedia

14. The Berlin Wall Checkpoint Standoff

In 1961, U.S. and Soviet tanks faced off at Checkpoint Charlie in a tense standoff. For a brief period, it seemed like a single shot could trigger open conflict. Both sides eventually pulled back, but the moment was razor-thin.

Juggling_on_the_Berlin_Wall_1.jpg: Yann Forget derivative work: Durova (talk) on Wikimedia

15. The Failed Attempt on Lenin in 1918

Vladimir Lenin survived an assassination attempt that left him seriously wounded. His survival allowed him to continue shaping the early Soviet state. A different outcome might have altered the course of the Russian Revolution entirely.

Photo by Time Life Pictures/Mansell/The LIFE Picture Collection, published on LIFE on Wikimedia

16. The Spanish Armada’s Storms

England’s defense against the Spanish Armada wasn’t just military—it was meteorological. Severe storms scattered and damaged the Spanish fleet at critical moments. Without that weather, the balance of power in Europe might have shifted.

anonymous  on Wikimedia

17. The Near Miss of Asteroid 2012 DA14

In 2013, an asteroid passed closer to Earth than many satellites.

It didn’t hit, but the proximity was a reminder of how little margin there sometimes is. Events like that don’t make history—but they easily could.

NASA/JPL on Wikimedia

18. The Assassination Attempt on Theodore Roosevelt

Roosevelt was shot in 1912 but continued his speech with the bullet still lodged in his chest. The thick stack of papers in his pocket slowed the bullet enough to save his life. A thinner speech, and the outcome might have been very different.

Pach Brothers (photography studio) on Wikimedia

19. The Close Capture of Washingtoni in 1812

In 1814, British forces marched into Washington, D.C., and burned major government buildings, including the White House. President James Madison had already fled, and the situation was far more fragile than it’s often remembered. Had the British pressed further or managed to capture key leaders, the young United States could have faced a serious political collapse at a critical moment.

Unknown artistUnknown artist on Wikimedia

20. The Close Call of NORAD’s 1979 Computer Error

A training simulation was accidentally loaded into a live system, making it appear as though a massive nuclear attack was underway. For a brief period, real-world response protocols began to activate. The error was caught in time, but only just.

Chairman of the Joint Chiefs of Staff on Wikimedia