Thornton Affair was a confrontation between Mexican forces and a group of U.S. soldiers in Texas, marking the beginning of the Mexican-American War. This event was significant as it led to the U.S. gaining control over a significant amount of land, including present-day California, Nevada, Utah, Arizona, New Mexico, Texas, and parts of Colorado, Kansas, Oklahoma, and Wyoming. --AI analysis

Giacomo Agostini is an Italian multi-world champion motorcycle racer who won an absolute record of 16 World Championships and 12 Isle of Man TT wins. He is considered one of the greatest motorcycle riders of all time. --AI analysis

During World War II, the U.S. and Soviet Union forces met east of the Elbe River in Germany, marking a significant moment in the war as it showed the close collaboration between the two nations against Nazi Germany. --AI analysis

Francis Crick and James Watson published their groundbreaking research on the structure of DNA, revealing the double helix model that has become synonymous with genetics. This discovery revolutionized the field of molecular biology and has had profound implications for medicine and genetics. --AI analysis

The United States attempted a military operation to rescue the Iran hostages, but it ended in failure with eight U.S. servicemen dead and no hostages rescued. This event was a significant setback for the U.S. government and led to further tensions between the U.S. and Iran. --AI analysis

Violeta Chamorro became the first woman to serve as President of Nicaragua, marking a significant milestone for women in politics. Her presidency was notable for her efforts to rebuild the country after years of civil war. --AI analysis

The Federal Republic of Yugoslavia was proclaimed, comprising Serbia and Montenegro. This event marked the dissolution of the former Yugoslav state and the formation of new nations in the region. --AI analysis

The final piece of the Obelisk of Axum was returned to Ethiopia after being stolen by Italian troops over 60 years earlier. This event was significant for Ethiopia as it symbolized the return of a national treasure and a piece of their cultural heritage. --AI analysis

A devastating earthquake struck Nepal, killing at least 6,000 people and causing widespread destruction. This event highlighted the vulnerability of the region to natural disasters and the need for better preparedness and response measures. --AI analysis

The first-ever image of a black hole was released, captured by the Event Horizon Telescope project. This event marked a significant scientific achievement, providing visual evidence of the existence of black holes and shedding light on their nature. --AI analysis