1. On July 18, 1857, the first spark went up from the signal station at West Quoddy Head Light, which is located on the easternmost point of the contiguous United States. This marked the beginning of the operation of one of the most important lighthouses in the state's history.

2. July 18, 1898, was a significant day in Maine's history as it marked the arrival of the first U.S. troops returning from Cuba after the Spanish-American War. The soldiers arrived in Portland, and their arrival was celebrated with a grand parade through the city.

3. July 18, 1924, was the day when University of Maine professor and physicist Robert W. Wood was born. Wood is best known for his work in the field of optics and the development of the Wood's lamp, which is used to diagnose fungal infections on the skin.

4. On July 18, 1939, The Maine State Society for Crippled Children and Adults was established. The organization helped improve the lives of those with disabilities in Maine by providing services such as medical care, education, and support.

5. July 18, 1953, was the day when Augusta native Mike McGee was born. McGee went on to become a successful basketball player in the NBA, winning two championships with the Los Angeles Lakers in the 1980s.