1. New Hampshire became the ninth state to ratify the United States Constitution on June 20, 1788, making it an essential day in the state's history. After a contentious debate over the merits of the Constitution, New Hampshire finally voted to join the new nation, paving the way for others to follow.

2. On June 20, 1863, the 12th New Hampshire Volunteer Infantry Regiment fought in the Battle of Winchester during the American Civil War. The regiment suffered heavy casualties but helped to hold back Confederate forces long enough for Union troops to rally, leading to a Union victory.

3. The famous American poet, Robert Frost, was born on June 20, 1874, in San Francisco, California. Although not originally from New Hampshire, Frost spent many years living and writing in the state, where he found inspiration for some of his most famous works, such as "The Road Not Taken."

4. June 20, 1901, marked the day when New Hampshire became the first state to enact a compulsory automobile insurance law, requiring all motorists to carry liability insurance. This legislation helped to establish the nationwide practice of requiring drivers to have insurance coverage.

5. On June 20, 1945, the New Hampshire State Hospital was the site of a deadly fire that killed 39 patients and one staff member. The fire was a tragic event in New Hampshire's history, leading to increased safety measures and awareness around the importance of fire safety in public buildings.