January 23 in History

The ground split open across an area the size of Belgium, and within minutes an estimated 830,000 people were dead. The Shaanxi earthquake of January 23, 1556, remains the deadliest earthquake in recorded history—a catastrophe so vast that it killed roughly 60 percent of the region''s population and depopulated entire counties across China''s central plains. The earthquake struck in the early morning hours, centered in the Wei River valley of Shaanxi province (then called Shensi). The region was one of the most densely populated in Ming Dynasty China. Critically, millions of people lived in yaodongs—cave dwellings carved into the soft loess plateau hillsides. When the earthquake collapsed these cliffs, entire communities were buried alive in their homes. The loess soil, which can stand in vertical walls for centuries, liquefied and flowed like mud during the violent shaking. Contemporary accounts describe mountains and rivers changing places. The ground fissured open in crevasses 60 feet deep. Cities that had stood for centuries were leveled. Aftershocks continued for six months. County records from Huaxian report that "weights fell from the steelyard and fish leapt from the water." In some counties, 60 to 70 percent of all inhabitants perished. The Ming government, already straining under financial pressure and northern border threats, struggled to provide relief. Modern seismologists estimate the earthquake at approximately magnitude 8.0-8.3 on the Richter scale, with a maximum Mercalli intensity of XI. The extraordinary death toll was a function of population density, construction methods, and timing: a powerful quake hitting a crowded region of cave-dwellers in the dead of night. The disaster stands as a stark reminder that seismic risk is as much about where and how people live as it is about the power of the tremor itself.

Elizabeth Blackwell graduated first in her class from Geneva Medical College in upstate New York on January 23, 1849, becoming the first woman to receive a medical degree in the United States. She had been rejected by every major medical school in the country—at least 29 institutions turned her away before Geneva''s all-male student body voted to admit her, reportedly as a joke. Blackwell was born in Bristol, England, in 1821 and emigrated to the United States with her family as a child. The idea of pursuing medicine came from a dying friend who told her she might have been spared the worst indignities of her illness had her physician been a woman. Blackwell initially found the idea repugnant—she later wrote that she "hated everything connected with the body"—but the challenge itself drew her in. She studied privately with sympathetic physicians and saved money by teaching school. At Geneva, Blackwell endured social ostracism from the town''s women, who crossed the street to avoid her, and stiff resistance from some faculty. She was initially barred from classroom demonstrations involving the reproductive system. But her academic performance was undeniable. When she graduated at the top of her class, the dean placed her thesis on the topic of typhus in the college library, and even skeptical professors acknowledged her ability. After graduation, Blackwell trained in Paris and London, losing sight in one eye after contracting ophthalmia neonatorum from a patient. Returning to New York, she found that no hospital would hire her and no landlord would rent her office space. She responded by founding the New York Infirmary for Indigent Women and Children in 1857, staffed entirely by women. The institution trained a generation of female physicians. Blackwell later co-founded the London School of Medicine for Women in 1874, opening the profession on both sides of the Atlantic to those who had been told the practice of medicine was beyond their nature.

Seventeen of the Soviet Union''s most prominent Old Bolsheviks sat in the dock at the House of Trade Unions in Moscow, accused of conspiring with Leon Trotsky, Nazi Germany, and Imperial Japan to overthrow the Soviet state. The second Moscow Show Trial, which opened on January 23, 1937, was Joseph Stalin''s most elaborate piece of political theater—a spectacle designed to justify the elimination of everyone who might challenge his absolute power. The defendants included Karl Radek, a brilliant journalist and propagandist; Yuri Piatakov, deputy commissar of heavy industry; and Grigory Sokolnikov, a former finance commissar. All had been loyal Bolsheviks who had participated in the 1917 Revolution and served the Soviet government for decades. Under interrogation by the NKVD secret police, they had been broken through sleep deprivation, threats against their families, and physical torture, and they now delivered carefully rehearsed confessions to absurd crimes. The confessions were staggering in their implausibility. Piatakov claimed he had flown secretly to Oslo to meet Trotsky, a trip later disproven when Norwegian authorities confirmed no such flight had landed. Radek, who retained enough wit to occasionally veer from the script, told the court he was guilty of "not having been a genuine accomplice" but was found guilty nonetheless. Foreign journalists who attended the trial were divided—some believed the confessions, while others recognized the choreography of state terror. Thirteen of the seventeen defendants were sentenced to death and shot. Radek and Sokolnikov received prison sentences but were later killed in custody. The Trial of the Seventeen was the middle act of the Great Purge, which between 1936 and 1938 consumed an estimated 750,000 executions and millions of imprisonments. Stalin eliminated virtually the entire generation of revolutionaries who had built the Soviet Union alongside Lenin, replacing them with a terrified bureaucracy whose only qualification was unquestioning obedience.

Paying to vote became unconstitutional in the United States on January 23, 1964, when the Twenty-Fourth Amendment was ratified by the required 38th state, South Dakota. The amendment banned poll taxes in federal elections, dismantling one of the most effective tools that Southern states had used for seven decades to prevent Black Americans from exercising their right to vote. Poll taxes had been embedded in Southern state constitutions since the 1890s, part of a deliberate architecture of disenfranchisement that included literacy tests, grandfather clauses, and white-only primaries. The tax, typically one to two dollars per election (equivalent to $20-40 today), fell hardest on Black sharecroppers and poor whites. Some states required cumulative payment—voters owed the tax for every year they had been eligible, creating debts that made registration impossible. In Mississippi, voter registration among Black citizens dropped from 90 percent during Reconstruction to under 6 percent by 1900. Congressional efforts to ban the poll tax had begun in the 1940s, but Southern Democrats repeatedly blocked legislation through filibusters. President Kennedy endorsed a constitutional amendment approach in 1962, reasoning that an amendment could not be filibustered in the same way as ordinary legislation. The amendment passed Congress in August 1962 and was ratified in just over 17 months—quick by constitutional standards, reflecting broad national support. The amendment''s scope was limited: it applied only to federal elections, leaving state and local poll taxes intact. Virginia responded by creating a complicated certificate-of-residence requirement as a substitute. It took the Supreme Court''s 1966 decision in Harper v. Virginia Board of Elections to strike down poll taxes in state elections as well. The Twenty-Fourth Amendment was a critical step, but not the final one, in the long struggle to make the Fifteenth Amendment''s promise of voting rights a reality. The Voting Rights Act of 1965, passed the following year, provided the enforcement mechanism the amendment alone could not.

After nearly a decade of bombing, ground combat, and diplomatic maneuvering, Henry Kissinger and Le Duc Tho initialed a peace agreement in Paris that would end direct American military involvement in Vietnam. The Paris Peace Accords, signed on January 23, 1973 (formally signed January 27), represented the culmination of secret negotiations that had dragged on for five years and produced a deal remarkably similar to one available in 1969. The accords called for a ceasefire in place, the withdrawal of all remaining U.S. forces within 60 days, the return of American prisoners of war, and the continuation of the Thieu government in South Vietnam. Crucially, the agreement allowed North Vietnamese troops already in the South to remain—a concession that South Vietnamese President Nguyen Van Thieu bitterly opposed. Kissinger and President Nixon pressured Thieu to accept by privately promising massive American retaliation if North Vietnam violated the terms. The path to this agreement had been brutal. When talks stalled in December 1972, Nixon ordered Operation Linebacker II, an eleven-day carpet-bombing campaign over Hanoi and Haiphong that dropped more tonnage than any period of the entire war. Fifteen B-52 bombers were shot down, and international condemnation was fierce. Whether the bombing broke the deadlock or merely provided diplomatic cover for terms already on the table remains debated by historians. Both Kissinger and Le Duc Tho were awarded the 1973 Nobel Peace Prize. Tho declined it, stating that peace had not yet been achieved in Vietnam—a judgment the following two years would confirm. North Vietnam launched its final offensive in early 1975, and the promised American retaliation never came. Saigon fell on April 30, 1975. The accords had ended American involvement but not the war itself, and the "peace with honor" Nixon promised proved to be neither.