1. On April 4, 1818, the New Hampshire Supreme Court made a decision that would change the state's education system. The court ruled that towns were required to provide public education for their children, which led to the creation of a statewide system of public schools.

2. On April 4, 1862, the 5th New Hampshire Volunteer Infantry Regiment took part in the Battle of Yorktown during the American Civil War. The regiment, which was raised in New Hampshire, played a crucial role in the Union victory.

3. On April 4, 1936, the New Hampshire Legislature passed a resolution officially designating the white birch tree as the state tree. The white birch is a common sight in the state's forests and is known for its distinctive white bark.

4. On April 4, 1947, the New Hampshire Senate passed a bill to establish the Mount Washington Observatory. The observatory, located at the summit of Mount Washington, is known for its extreme weather conditions and has been used to gather data on climate and weather patterns for decades.

5. On April 4, 1973, the New Hampshire Supreme Court issued a landmark ruling in the case of State v. Pike. The court ruled that the state's statute criminalizing sodomy was unconstitutional, making New Hampshire one of the first states to decriminalize consensual same-sex relationships.