Highlight: In President Warren G. Harding became the first chief executive to file an income tax return, paying a levy of $17,990 on his $75,000 salary.

In 1794, Eli Whitney received a patent for his cotton gin, an invention that revolutionized America’s cotton industry.

In 1900, Congress ratified the Gold Standard Act.

In 1907, President Theodore Roosevelt signed an executive order designed to prevent Japanese laborers from immigrating to the United States as part of a “gentlemen’s agreement” with Japan.

In 1939, the republic of Czechoslovakia was dissolved, opening the way for Nazi occupation of Czech areas and the separation of Slovakia.

In 1951, during the Korean War, United Nations forces recaptured Seoul.

In 1964, a jury in Dallas found Jack Ruby guilty of murdering Lee Harvey Oswald, the accused assassin of President John F. Kennedy, and sentenced him to death.

In 1967, the body of President John F. Kennedy was moved from a temporary grave to a permanent memorial site at Arlington National Cemetery in Virginia.

In 1975, “Monty Python and the Holy Grail,” a sendup of the legend of King Arthur, had its world premiere in Los Angeles.

In 1980, a LOT Polish Airlines jet crashed while attempting to land in Warsaw, killing all 87 people aboard, including 22 members of a U.S. amateur boxing team.

In 1990, the Soviet Congress of People’s Deputies held a secret ballot that elected Mikhail S. Gorbachev to a new, powerful presidency.

In 1998, India’s Congress party picked Sonia Gandhi, the Italian-born widow of assassinated prime minister Rajiv Gandhi, as its new president.

Ten years ago: A tornado ripped into the Georgia Dome during the Southeastern Conference tournament, sending debris tumbling from the ceiling and prompting fans to flee. Protests led by Buddhist monks against Chinese rule in Tibet turned violent, leading to an extensive crackdown by China’s military. Lindsey Vonn completed the first American sweep of the overall World Cup titles in 25 years, a day after Bode Miller won his second overall crown in Bormio, Italy.

Five years ago: Some 10,000 workers from across the European Union protested outside a summit of EU leaders in Brussels, demanding they end years of austerity and focus instead on curbing runaway unemployment with more spending.

One year ago: President Donald Trump earned $153 million and paid $36.5 million in income taxes in 2005, according to highly sought-after tax documents disclosed by a reporter. Declaring “enough is enough,” Mitch Seavey won his third Iditarod Trail Sled Dog Race, becoming the fastest and oldest champion at age 57. Seavey also set a time record of 8 days, 3 hours, 40 minutes and 13 seconds.