On the Ides of March, Roman dictator Julius Caesar was assassinated by a group of senators led by Brutus, Cassius, and others, who feared his growing power threatened the Republic. Caesar was stabbed 23 times inside the Theatre of Pompey. His death triggered a series of civil wars that ultimately ended the Roman Republic and paved the way for the rise of the Roman Empire under his adopted heir, Octavian (later Augustus).

The World Health Organization officially declared the global outbreak of the novel coronavirus (COVID-19) a pandemic. This announcement acknowledged the rapid worldwide spread of the virus, which had already infected over 100,000 people across multiple continents. The declaration led to drastic public health measures, lockdowns, and economic disruptions on a global scale, marking the beginning of one of the most significant health crises in modern history.

During a peaceful march for voting rights in Selma, Alabama, civil rights activists were brutally attacked by state troopers and local law enforcement on the Edmund Pettus Bridge. The violence, broadcast on national television, shocked Americans and drew widespread support for the Civil Rights Movement. The events of 'Bloody Sunday' directly influenced the passage of the Voting Rights Act of 1965, a landmark piece of U.S. civil rights legislation.

In World War I, Germany launched the Spring Offensive, also known as the Ludendorff Offensive, on the Western Front. It was Germany’s last major attempt to break the stalemate before American forces could arrive in large numbers. Using new infiltration tactics and overwhelming artillery, German forces initially made significant gains. However, supply issues and Allied counterattacks eventually halted the advance, setting the stage for Germany’s ultimate defeat later that year.

President Abraham Lincoln, the 16th President of the United States, was shot by Confederate sympathizer John Wilkes Booth while attending a play at Ford’s Theatre in Washington, D.C. Lincoln died the following morning, becoming the first U.S. president to be assassinated. His death came just days after the Civil War effectively ended, plunging the nation into mourning and shaping the course of Reconstruction.

Soviet cosmonaut Yuri Gagarin made history by becoming the first human to travel into space and orbit the Earth aboard the Vostok 1 spacecraft. His successful 108-minute flight marked a major milestone in the Space Race between the United States and the Soviet Union, boosting Soviet prestige and accelerating global interest in space exploration.

Millions of Americans participated in the first Earth Day, a nationwide demonstration calling for environmental protection and awareness. Organized by Senator Gaylord Nelson, the event brought together activists, students, and communities to protest pollution, oil spills, and the destruction of natural habitats. Earth Day is credited with helping to launch the modern environmental movement and led to the creation of landmark U.S. legislation such as the Clean Air Act and the Environmental Protection Agency.

The British luxury liner RMS Titanic, the largest and most advanced passenger ship of its time, struck an iceberg in the North Atlantic on its maiden voyage from Southampton to New York. The ship sank in the early hours of April 15, resulting in the deaths of more than 1,500 of the 2,200 passengers and crew on board. The disaster exposed serious flaws in maritime safety practices and led to major reforms, including requirements for sufficient lifeboats and the establishment of the International Ice Patrol.