On January 3, 1521, Pope Leo X issues the papal bull Decet Romanum Pontificem, which excommunicates Martin Luther from the Catholic Church.

Escalating the tensions that would lead to rebellion and war, the Mexican government imprisons the Texas colonizer Stephen Austin in Mexico City.

On January 3, 1861, just two weeks after South Carolina became the first state to secede from the Union, the state of Delaware rejects a similar proposal.

In an event that heralds the birth of modern Japan, patriotic samurai from Japan’s outlying domains join with anti-shogunate nobles in restoring the emperor to power after 700 years.

Similar to Adolf Hitler, Italian Fascist leader Benito Mussolini did not become the dictator of a totalitarian regime overnight. For several years, he and his allies worked more or less within the confines of the Italian constitution to accrue power, eroding democratic institutions until the moment came for them to be done away with entirely. It is generally agreed that that moment came in speech Mussolini gave to the Italian parliament on January 3, 1925, in which he asserted his right to supreme power and effectively became the dictator of Italy.

On January 3, 1957 Dalip Singh Saund is sworn in as the congressional representative of California’s 29th district. Known to many as “Judge,” and also nicknamed “the Peacemaker,” he is the first Asian, first Indian American, first Sikh and first follower of a non-Abrahamic religion to be elected to the United States Congress.

On January 3, 1959, George A. Kasem takes office in the U.S. House of Representatives for California’s 25th District, making history as the first Arab American Congressperson.

In the climax of deteriorating relations between the United States and Fidel Castro’s government in Cuba, President Dwight D. Eisenhower closes the American embassy in Havana and severs diplomatic relations.

On January 3, 1973, a 12-member group headed by George Steinbrenner purchases the New York Yankees for $10 million from Columbia Broadcasting System, which owned the team since 1964. The group includes CBS’s Yankees president Michael Burke, who briefly serves in that role under Steinbrenner. Known by many as "The Boss," Steinbrenner goes on to become one of the more controversial owners in sports history.

On January 3, 1987, Rock and Roll Hall of Fame admits its first woman: Aretha Franklin. Fewer than 100 female performers—less than 10 percent—have been added since the Hall began its induction ceremonies.

Matthew Stuart meets with Boston prosecutors and tells them that his brother, Charles, was actually the person responsible for murdering Charles’s wife, Carol. The killing of Carol Stuart, who was pregnant at the time, on October 23, 1989, had touched off a national outrage when Charles Stuart told authorities that the couple had been robbed and shot by an African American man while driving through a poor Boston neighborhood.

The Mars Exploration Rover Spirit lands on the Red Planet on January 3, 2004. 21 days later, its twin, Opportunity, also arrived safely. In one of the longest and most successful missions in NASA history, Spirit would survey Martian geography for the next seven years, while Opportunity remained active until June of 2018.