1. On June 5, 1783, the Continental Congress established the first Executive Department of Foreign Affairs, which would later become the United States Department of State. This department played a crucial role in negotiating treaties and maintaining diplomatic relations with other nations, including Connecticut's trading partners.

2. In 1883, the first meeting of the Connecticut Bar Association was held in Hartford on June 5. This organization was formed to promote the interests of lawyers and improve the legal profession in Connecticut.

3. On June 5, 1917, the first Liberty Loan campaign was launched in Connecticut as part of the effort to finance America's involvement in World War I. This campaign raised a total of $2.25 billion nationwide to support the war effort.

4. The Hartford Abolitionist Society, an organization dedicated to the abolition of slavery, was founded on June 5, 1838. Connecticut played a significant role in the abolitionist movement, with many prominent leaders, including Harriet Beecher Stowe, hailing from the state.

5. The Connecticut River Museum, located in Essex, Connecticut, opened its doors on June 5, 1974. This museum is dedicated to the history and culture of the Connecticut River Valley, with exhibits on the river's ecology, maritime history, and Native American heritage.