1. In 1802, Connecticut abolished slavery. This made it the first state to do so voluntarily, although slavery had been largely abolished in practice in the state for decades prior.

2. On September 10, 1875, the New Haven Fire Department was officially established. It was the first fire department in the United States to use a steam-powered fire engine.

3. The Connecticut State Capitol building was dedicated on September 10, 1879. The building, designed by architect Richard M. Upjohn, is located in Hartford and is home to the state's legislative and executive branches.

4. On September 10, 1966, the famous folk music festival "The Connecticut Folk Festival and Green River Revival" was held in Washington, CT. This concert featured notable performers such as Joan Baez and Bob Dylan.

5. New Haven, Connecticut was the site of the first hamburger restaurant in the United States. On September 10, 1900, Louis' Lunch opened its doors and began serving hamburgers to customers. To this day, the restaurant still operates in the same location and prepares their burgers in the same exact way as they did over 100 years ago.