1. The Connecticut State Library was founded on May 11, 1854. It was initially located in the State Capitol Building and later moved to its current location in Hartford.

2. On May 11, 1977, Yale University announced that it would admit women to its undergraduate program for the first time in its 276-year history. The announcement came after a long and contentious debate among the faculty and administration.

3. On May 11, 1818, the state of Connecticut ratified the U.S. Constitution's 20th Amendment, which established the terms of the presidential and congressional terms of office and succession.

4. On May 11, 2005, the Connecticut Supreme Court ruled in favor of same-sex marriage in the case of Kerrigan v. Commissioner of Public Health. This ruling made Connecticut the second state in the nation to legalize same-sex marriage.

5. On May 11, 1909, the Connecticut legislature passed a law that established the state's first vocational school, which was named the Connecticut Trade School. The school was later renamed to the Eli Whitney Technical High School in honor of the inventor Eli Whitney.