1. In 1817, the Hartford Convention began on December 10. This was a meeting of representatives from several New England states who gathered to discuss their grievances with the federal government, particularly the War of 1812. The convention ultimately helped lead to the demise of the Federalist Party.

2. December 10, 1845, marked the opening of the Connecticut Asylum for the Education and Instruction of Deaf and Dumb Persons in Hartford. This was the first school of its kind in the United States and laid the groundwork for the education of deaf and hearing-impaired individuals across the country.

3. In 1868, the first recorded ice hockey game in Connecticut took place on December 10 in New Haven. The Yale Bulldogs defeated Johns Hopkins University 2-0 in this historic match.

4. December 10, 1906, marked the first performance of Mark Twain's "Is Shakespeare Dead?" in New Haven. This play explored Twain's skepticism about the authorship of Shakespeare's works and became one of his most popular productions.

5. Finally, on December 10, 2018, Connecticut Governor Dannel Malloy signed into law a bill that abolished the state's death penalty. This made Connecticut the 17th state in the United States to end the use of capital punishment.