1. On February 18, 1878, the Connecticut State Capitol in Hartford was completed after six years of construction. The building is a stunning example of Victorian Gothic architecture and is a significant landmark in Connecticut.

2. On February 18, 1931, famous playwright Eugene O'Neill's play "Mourning Becomes Electra" premiered in New York City. O'Neill, who was born in New London, Connecticut, is considered one of America's finest playwrights and is a key figure in American theater history.

3. Connecticut became the fifth state to ratify the United States Constitution on February 18, 1788. The Constitution went into effect on March 4, 1789, and Connecticut was a key player in establishing the federal government of the United States.

4. A long-lasting snowstorm hit Connecticut on February 18 and 19, 2015, dumping over two feet of snow in some areas. The storm, known as Winter Storm Neptune, caused widespread power outages and travel disruptions and was one of the biggest storms to hit Connecticut in recent years.

5. On February 18, 1970, the first lesbian and gay rights organization in Connecticut was founded in Hartford. The organization, known as the Hartford Gay Alliance, was established to promote and protect the rights of the LGBTQ+ community and was a significant milestone in the fight for LGBTQ+ rights in Connecticut.