1. The Boston Tea Party occurred on December 10, 1773, when a group of colonists dressed as Native Americans threw tea from three British ships into Boston Harbor in protest of British taxation without representation.

2. On December 10, 1869, the Massachusetts State House was dedicated in Boston. The building, designed by architect Charles Bulfinch, is notable for its distinctive dome, which was made with copper sheathing by Paul Revere and his sons.

3. The first true submarine invented by Irish revolutionary John Holland was successfully tested in the Charles River on December 10, 1898. The vessel, partially funded by the Irish Fenian Brotherhood, eventually became the basis for the United States Navy's submarine force.

4. Massachusetts became the first state in the nation to legalize same-sex marriage on December 10, 2003. The landmark decision followed a ruling by the state's highest court that denying marriage to same-sex couples violated the state's constitution.

5. On December 10, 2014, Boston medical doctor Richard Sacra, the first person to be diagnosed with Ebola in the United States, returned to Worcester after being successfully treated at a Nebraska hospital. Sacra contracted the virus while treating patients in Liberia.