May 17 in History

The Continental Congress just banned trade with their best customer. Canada had been buying American grain, livestock, and lumber for years—keeping colonial ports alive. But on July 15, 1775, delegates voted to cut off everything. No exports, no imports. The goal? Force Canada to join the rebellion or starve their British garrisons. It didn't work. Canadians stuck with Britain, found new suppliers, and American merchants lost fortunes overnight. Some smuggled across the border anyway, risking treason charges. Turns out economic warfare hurts both sides, and loyalty doesn't follow trade routes.

The fastest constitution ever written took just five weeks—112 men locked themselves in a manor house outside Eidsvoll and hammered out Norway's founding document while Sweden's army massed at the border. Crown Prince Christian Frederick knew he'd be king for maybe four months. He was right. By October, Norway had to accept Swedish rule anyway. But here's what stuck: those 112 men refused to just hand over sovereignty, so Sweden had to let them keep their constitution. Sometimes losing slowly beats losing fast.

Union forces under General McClernand overran Confederate earthworks at Big Black River Bridge, capturing 1,700 soldiers and eighteen cannons in a twenty-minute assault. The rout eliminated the last organized defense between Grant's army and Vicksburg, allowing Union troops to reach the fortress city's perimeter the following day.

Imperial Japanese forces defeated the last Tokugawa loyalists at the Battle of Hakodate, ending the Boshin War and completing the military unification of Japan under the Meiji emperor. The surrender of the Republic of Ezo dissolved the final holdout of shogunate resistance and cleared the path for Japan's transformation from feudal state to industrialized world power.

The siege lasted 217 days, and by the end, the British garrison was eating horse meat mixed with oats meant for livestock. Colonel Baden-Powell turned the defense of this dusty railway junction into a masterclass of bluffing—fake minefields, cardboard cannons, and a homemade howitzer called "Lord Nelson" that barely worked. When relief columns finally broke through on May 17, 1900, the news sparked wild celebrations across Britain. Street parties. Church bells. Total jubilation. What nobody mentioned: the town's black residents had been systematically starved to preserve rations for whites. Same siege, different war entirely.

A bronze lump sat in a wooden crate for two years before Valerios Stais noticed the gear wheel. The other archaeologists had walked right past it—corroded junk from a Roman shipwreck off Antikythera, nothing worth cataloging. But Stais saw what looked like clockwork. From 150 BC. Impossible, obviously. Except it wasn't. The thing predicted eclipses, tracked Olympic games, mapped planetary motion using 37 bronze gears that wouldn't be matched in complexity for another 1,000 years. We lost the blueprint for a computer designed when Rome was still a republic.

The deal gave Northern Epirus everything except what mattered: Greek sovereignty. After months of ethnic Greek villages burning under Albanian rule, the Great Powers gathered in Corfu and sketched autonomy on paper—their own schools, their own churches, their own officials. All under Albania's flag. The Protocol lasted exactly five months before World War I turned Balkans maps into rough drafts. But here's what stuck: every boundary dispute in the region for the next century would cite Corfu as precedent. Autonomy, it turned out, was just annexation in slow motion.

The test flight wasn't supposed to happen that day. Major Harold Geiger, who'd taught hundreds of Army pilots to fly and helped write the Air Service's safety manual, took his Airco DH.4 up over Olmstead Field on May 17, 1927. Something failed. The plane dove into Pennsylvania farmland. He was 37. Within months, the Army renamed the field in his honor—Olmstead became Geiger Field. The man who'd spent a decade making military aviation safer died doing the thing he'd taught others to survive. His manual stayed in use for another twenty years.

Hjort was the respectable one — lawyer, diplomat, former government minister. Quisling was the army officer who'd worked for Nansen, helped save millions from Soviet famine, then soured into antisemitism and conspiracy theories about Freemasons. Together they founded Nasjonal Samling in 1933, Norway's first fascist party. It flopped spectacularly: two percent in the 1933 elections, 1.8 percent in 1936. Norwegians wanted nothing to do with them. Then Germany invaded in 1940, and suddenly Hitler needed a Norwegian face for occupation. Failure became useful. Now Quisling's name means traitor in twelve languages.

The anarchists who'd helped save Barcelona from Franco's coup in 1936 found themselves locked out of government a year later. Francisco Largo Caballero's cabinet collapsed after Barcelona's May Days left hundreds dead in street fighting—not between Republicans and Fascists, but between rival leftist factions. Juan Negrín formed a new government on May 17, 1937, excluding the CNT entirely. The anarcho-syndicalists who'd collectivized factories and fielded militias now watched from the sidelines. Turns out you can lose a civil war before the other side even beats you.