1. On August 4, 1902, the Hartford Electric Light Company began constructing a new power plant in Rocky Hill, Connecticut. The plant would eventually provide electricity to Hartford and surrounding towns for many years.

2. August 4, 1934, marked the 150th anniversary of the establishment of the U.S. Post Office in Connecticut. The first post office in the state was established in Fairfield in 1684.

3. On August 4, 1954, the Connecticut Fish and Game Commission announced plans to stock the Farmington River with Atlantic salmon. Over the years, the river has become a popular spot for anglers, with a thriving population of trout and other fish.

4. The Hartford Whalers hockey team played their first game in the Hartford Civic Center on August 4, 1975. The team would later move to North Carolina in 1997, but their legacy remains a significant part of Connecticut sports history.

5. August 4, 2011, marked the first day of the 64th Annual Connecticut Open Tennis Tournament, held at the Connecticut Tennis Center in New Haven. Over the years, the tournament has attracted top players from around the world, including Maria Sharapova, Venus Williams, and Caroline Wozniacki.