May 17

May 17 is the 138th day of the year, and the American record for it runs from 1863 to 2004 — a span of 141 years. The entry that anchors it: The United States Supreme Court hands down a unanimous decision in Brown v. Board of Education of Topeka, 1954.

Through the nineteenth century the date gathered the tensions that would define the era. In 1863, American Civil War — at the Battle of Big Black River Bridge in Mississippi, Union forces under John A. McClernand defeated a Confederate rearguard and captured around 1,700 men.

As the country moved into the modern age, the date accumulated new kinds of firsts. In 1939, the Columbia Lions and the Princeton Tigers play in the United States' first televised sporting event, a collegiate baseball game in New York City.

In the postwar decades the date belonged to a nation of enormous reach and unfinished arguments. In 1954, the United States Supreme Court hands down a unanimous decision in Brown v. Board of Education of Topeka, Kansas, outlawing racial segregation in public schools. Then, in 1973, Watergate scandal — Televised hearings begin in the United States Senate. Ten years on, in 1983, the U.S. Department of Energy declassifies documents showing world's largest mercury pollution event in Oak Ridge, Tennessee (ultimately found to be 4.2 million pounds [1.9 kt]), in response to the Appalachian Observer's Freedom of Information Act request. The same year, Lebanon, Israel, and the United States sign an agreement on Israeli withdrawal from Lebanon. Four years on, in 1987, Iran–Iraq War — an Iraqi Dassault Mirage F1 fighter jet fires two missiles into the U.S. Navy warship USS Stark, killing 37 and injuring 21 of her crew.

In living memory, the date has kept adding to the record. In 2004, Massachusetts became the first U.S. state to legalize same-sex marriage.

The date is also a birthday. Among the Americans born on May 17: Seth Warner (1743), American colonel; Ezra Otis Kendall (1818), American professor, astronomer and mathematician; Charlotte Barnum (1860), American mathematician and social activist; Horace Elgin Dodge (1868), American businessman, co-founded Dodge; and George Sheldon (1874), American diver.

May 17 is also a date of endings. Among the Americans who died on it: John Gunby (1807), American general; John Jay (1829), American politician and diplomat, 1st Chief Justice of the United States; John C. Breckinridge (1875), American lawyer and politician, 14th Vice President of the United States, Confederate States general; and Asa Packer (1879), American businessman, founded Lehigh University.

The date carries formal observance as well — International Day Against Homophobia, Biphobia and Transphobia. Read end to end, May 17 is less a list than a cross-section: 8 entries that happen to share a square on the calendar, separated by as much as 141 years. The coincidence is arbitrary; the accumulation is not.