October 1

October 1 is the 275th day of the year, and the American record for it runs from 1800 to 2017 — a span of 217 years. The entry that anchors it: The George Washington Bridge in the United States is opened, 1931.

By the middle of the nineteenth century the date carries heavier freight. In 1800, Via the Third Treaty of San Ildefonso, Spain cedes Louisiana to France, which would sell the land to the United States thirty months later.

In the postwar nineteenth century the date tracks a nation rebuilding. In 1890, at the encouragement of preservationist John Muir and writer Robert Underwood Johnson, the U.S. Congress established Yosemite National Park in California. A year later, in 1891, Stanford University opens its doors in California, United States.

In the first half of the twentieth century the date turns technological. In 1931, the George Washington Bridge in the United States is opened, linking New Jersey and New York. Nine years on, in 1940, the Pennsylvania Turnpike, often considered the first superhighway in the United States, opens to traffic.

The postwar entries show a nation both expanding and contesting itself. In 1953, a United States-South Korea mutual defense treaty is concluded in Washington, D.C.

Closer to the present, the date is still accumulating. In 1994, Palau enters a Compact of Free Association with the United States. Then, in 2017, Sixty people are killed and 867 others injured in a mass shooting at a country music festival at the Las Vegas Strip in the United States; the gunman, Stephen Paddock, later commits suicide.

The date is also a birthday. Among the Americans born on October 1: William Shippen (1712), American physician and politician; Richard Stockton (1730), American lawyer, jurist, and politician; Mary Anna Custis Lee (1808), American wife of Robert E. Lee; Caroline Harrison (1832), American educator, 24th First Lady of the United States; and Henry Clay Work (1832), American composer and songwriter.

October 1 is also a date of endings. Among the Americans who died on it: James Bunbury White (1819), American politician; Robert Clark (1837), American politician; Rose O'Neal Greenhow (1864), American spy; and John Light Atlee (1885), American physician and surgeon.

The date carries formal observance as well — Beginning of the United States' Fiscal Year; International Day of Older Persons; and National Day of the People's Republic of China (People's Republic of China). 8 entries, 217 years, one square on the calendar. October 1 is a reminder that history is experienced as an ordinary day before it is remembered as a date.