1. On February 21, 1787, The Confederation Congress in Massachusetts adopted a resolution that agreed to a convention to write a new constitution for the United States. The convention went on to draft the U.S. Constitution later that year.

2. In 1828, the First National Women's Rights Convention was held in Worcester, Massachusetts on February 21 and 22. The convention was organized by prominent abolitionists Lucretia Mott and Elizabeth Cady Stanton, and paved the way for the women's suffrage movement in America.

3. On February 21, 1831, Amherst College was officially founded in Amherst, Massachusetts. The college, which was originally for men only, became coeducational in 1975.

4. In 1947, on February 21, Edwin Land demonstrated the first instant camera in New York City. Land, who was the founder of the Polaroid Corporation, had invented the camera that could develop a photo in 60 seconds or less.

5. On February 21, 2005, the Massachusetts Supreme Judicial Court issued a landmark ruling that made Massachusetts the first U.S. state to legalize same-sex marriage. The case was brought by seven same-sex couples who were denied marriage licenses, and the ruling cleared the way for other states to follow suit in the years that followed.