Ancient tradition holds that after the Battle of Marathon, a runner named Pheidippides sprinted to Athens to deliver news of the Greek victory, gasping the word 'Nike'—victory—before dying of exhaustion. The story, first recorded centuries after the battle, inspired the modern marathon race distance. Historians question its accuracy, since the historian Herodotus, writing closest to the events, never mentions the run at all.

Traditionally dated to this period in 476, the Germanic warlord Odoacer forced the abdication of the teenage emperor Romulus Augustulus in Ravenna. Odoacer sent the imperial regalia to Constantinople rather than claiming the title of emperor for himself, effectively ending the Western Roman Empire. Historians still debate the precise date, but the event marks the conventional close of antiquity in Western Europe.

As the Austro-Hungarian Empire disintegrated in the final days of World War One, Slovak political representatives meeting in the town of Turčiansky Svätý Martin issued a declaration endorsing union with the Czech lands to form a single independent state. Combined with the Czech declaration of independence days earlier in Prague, the move cemented the birth of Czechoslovakia, a multiethnic democracy carved from the wreckage of the Habsburg monarchy.

The Grand National Assembly in Ankara formally declared Turkey a republic, abolishing the last vestiges of the Ottoman sultanate and electing revolutionary general Mustafa Kemal, later given the surname Atatürk, as its first president. The declaration followed the Turkish War of Independence and launched sweeping secular reforms—new alphabet, legal codes, and dress—that transformed a fallen empire into a modern nation-state.

On Black Tuesday, panicked investors dumped 16.4 million shares on the New York Stock Exchange, a record that stood for nearly forty years. The Dow Jones Industrial Average lost about 12 percent in a single session, capping a week of collapse that erased billions in paper wealth. The crash did not single-handedly cause the Great Depression, but it shattered confidence and triggered a decade of global economic misery.

Canadian, British, and Polish forces pressed a brutal amphibious and infantry campaign through the flooded lowlands of the Scheldt estuary in the Netherlands, fighting to clear German defenders and open shipping access to the port of Antwerp. Waged in freezing mud and deliberately flooded polders, the five-week battle cost the First Canadian Army over 12,000 casualties but finally secured the Allies' most crucial supply artery in northwest Europe.

At 10:30 PM, computer science student Charley Kline attempted to transmit the word 'LOGIN' from a UCLA computer to a Stanford Research Institute machine 350 miles away. The system crashed after the letters 'L' and 'O' went through, producing an accidental but fitting first message: 'LO'. The connection was fixed within the hour, marking the birth of the network that would evolve into the internet.

Hurricane Sandy, a massive post-tropical cyclone spanning over 1,000 miles, struck the New Jersey coast, sending a record storm surge into New York Harbor that flooded subway tunnels, knocked out power to millions, and set Lower Manhattan streets underwater. The storm caused roughly $70 billion in damage across the United States, becoming one of the costliest hurricanes in American history and prompting major rethinking of coastal flood defenses.