At the Battle of Mechanicsville, Virginia, Confederate General Robert E. Lee’s Army of Northern Virginia strikes Union General George B. McClellan’s Army of the Potomac, beginning the Seven Days’ Battles. Although the Confederates sustained heavy losses and did not succeed in decisively defeating the Yankees, the battle had unnerved McClellan. During the next week, Lee drove him from the outskirts of Richmond, Virginia, back to his base on the James River.

In the Herbst Theater auditorium in San Francisco, delegates from 50 nations sign the United Nations Charter, establishing the world body as a means of saving “succeeding generations from the scourge of war.” The Charter was ratified on October 24, and the first U.N. General Assembly met in London on January 10, 1946.

In a ceremony presided over by U.S. President Dwight D. Eisenhower and Queen Elizabeth II, the St. Lawrence Seaway is officially opened, creating a navigational channel from the Atlantic Ocean to all the Great Lakes. The seaway, made up of a system of canals, locks, and dredged waterways, extends a distance of nearly 2,500 miles, from the Atlantic Ocean through the Gulf of St. Lawrence to Duluth, Minnesota, on Lake Superior. The seaway had been operational for two months.

On the morning of June 26, 1974, at a supermarket in Troy, Ohio, a pack of Wrigley's Juicy Fruit chewing gum becomes the first grocery item scanned with a Universal Product Code, or UPC. The result of years of scientific experimentation and industry cooperation, the UPC barcode would go on to be used well beyond the grocery checkout counter, becoming a ubiquitous feature of modern commerce, with billions of barcodes scanned daily.

On June 26, 2003, the U.S. Supreme Court strikes down Texas’ sodomy laws, along with similar laws in 13 other states. The decision in Lawrence v. Texas is a landmark one, reaffirming the existence of a “right to privacy” that is not enumerated in the Constitution and effectively legalizing same-sex sexual activity in the United States.

June 26, 2015 marks a major milestone for civil rights in the United States, as the Supreme Court announces its decision in Obergefell v. Hodges. By one vote, the court rules that same-sex marriage cannot be banned in the United States and that all same-sex marriages must be recognized nationwide, finally granting same-sex couples equal rights to heterosexual couples under the law.