1. New Hampshire became the ninth state to ratify the U.S. Constitution on January 20, 1788. This event marked a significant milestone in the formation of the United States as a nation.

2. On January 20, 1861, New Hampshire's Governor Ichabod Goodwin received a telegram from President-elect Abraham Lincoln, inviting him to join a meeting of Unionist governors in Washington D.C. This meeting was held in response to the growing tensions between the North and South over the issue of slavery.

3. January 20, 1905, marked the opening of the New Hampshire State House in Concord. This iconic building has served as the state's capital since its completion, and remains one of the most recognizable landmarks in New Hampshire.

4. On January 20, 1985, New Hampshire Governor John H. Sununu signed the state's first-ever comprehensive wetlands protection law. This legislation helped to protect and preserve some of the state's most important and sensitive natural habitats.

5. In a less positive event, on January 20, 2001, New Hampshire experienced a major ice storm that caused significant damage to the state's infrastructure and left hundreds of thousands without power. The storm resulted in several deaths and millions of dollars in damages.