1. On May 10, 1843, the first telegraph message from New York City to Baltimore, Maryland was sent through Connecticut. The message read "What hath God wrought?" and was sent by Samuel Morse, the inventor of the telegraph, from his studio in Washington, D.C. to his assistant, Alfred Vail, in Baltimore via a telegraph line that ran through Connecticut.

2. On May 10, 1869, the final spike was driven to complete the transcontinental railroad that connected the eastern and western coasts of the United States. Connecticut businessman, William H. Aspinwall, was involved in the project, serving as one of the founding directors of the Pacific Mail Steamship Company which transported passengers and cargo between California and Asia.

3. Connecticut's Mystic Seaport, the nation's leading maritime museum, officially opened to the public on May 10, 1941. The museum is home to some of the country's most significant maritime artifacts, including historic vessels, a planetarium, and a working shipyard.

4. On May 10, 2000, Connecticut became the second state in the nation to legalize same-sex civil unions. The law granted same-sex couples many of the legal benefits and rights of marriage, but did not allow them to actually get married.

5. On May 10, 2019, the Connecticut Supreme Court ruled that the state's school funding system was unconstitutional because it did not provide students with an adequate education. The ruling was the result of a decade-long lawsuit brought by a coalition of parents and students from some of the state's most economically disadvantaged cities. The court ordered the state to come up with a new funding formula that would better support all students.