1. Maine became the 23rd state in the United States on June 30, 1820. Maine was once a part of the Massachusetts Bay Colony, but due to political and economic differences, Maine separated and became its own state.

2. On June 30, 1908, a massive fire destroyed much of the town of Cherryfield, Maine. The fire started in a lumber yard and quickly spread throughout the town, destroying homes, businesses, and causing several injuries. The cause of the fire was never officially determined.

3. The Winslow-Holbrook-Merritt American Legion Post was established on June 30, 1919, in Portland, Maine. The post was named after three Maine soldiers who were killed in World War I. The post continues to serve veterans in the area today.

4. June 30, 1963, marked the final day of operations for the Maine Central Railroad. The railroad had connected many towns across Maine and was a vital part of the state's economy. However, with the rise of automobiles and trucks, the need for rail transportation declined.

5. On June 30, 2005, a new law was enacted in Maine that legalized same-sex marriage. Maine was the first state in the country to pass such legislation through the legislative process (as opposed to a court ruling or voter referendum). However, the law was later overturned by a voter referendum in 2009. It was not until 2012 that Maine legalized same-sex marriage through another voter referendum.