There are some dates which resonate through history as points of significance in the development of the nation. July 4 is celebrated as the day American’s announced their independence from Great Britain to the world and posterity (it was actually passed on July 2), the Civil War began on April 12, 1861, at Fort Sumter (although the nation had been violently divided for over a decade) and so on. Almost any day of the calendar year can be attributed to a significant event which impacted future generations. Most of these are forgotten.
For example, on April 4, 1973, a then little-noticed event took place which affects Americans all day every day – the first mobile telephone conversation was completed. September 3, 1928, is widely regarded as the birth date of television after Philo Farnsworth demonstrated his image dissector camera to the press on that date. On May 24, 1935, the Philadelphia Phillies and the Cincinnati Reds played a baseball game in which the Reds prevailed 2-1. The day and game are notable as the first Major League game played under the lights; today the majority of games, as well as outdoor contests in nearly all sports, are conducted at night.