1. On June 12, 1792, New Hampshire became the ninth state in the United States of America. The state played a crucial role in the American Revolution and was one of the thirteen colonies that declared independence from British rule.

2. June 12, 1804, marks the opening of the first toll road in New Hampshire, the Portsmouth and Concord Turnpike. The road was crucial in connecting the seaports of New Hampshire to other parts of the country.

3. On June 12, 1873, the first train to cross the Piscataqua River Bridge between New Hampshire and Maine occurred. The bridge, which still stands today and is now known as the Memorial Bridge, replaced the previous wooden bridge that had been in place since 1822.

4. June 12, 1943, was the date of the famous "trolley strike" in Manchester, New Hampshire. Over 100 workers went on strike to protest low wages and working conditions. The strike lasted for 53 days and was marked by picket lines, arrests, and violence.

5. On June 12, 1997, New Hampshire became the first state in the country to enact a law requiring children under the age of 18 to wear a helmet while riding a bicycle. The law has since been adopted by many other states in the US.