1. On June 30, 1787, Virginia became the tenth state to ratify the United States Constitution. The Constitution was written during the Constitutional Convention in Philadelphia from May to September 1787, and Virginia's ratification was a crucial step towards forming a strong federal government.

2. On June 30, 1835, the James River and Kanawha Canal in Virginia opened for shipping. The canal, which runs 197.8 miles from Richmond to Buchanan, was built to transport coal from the Appalachian Mountains to Richmond and then to the coast for export. It was a significant engineering feat for its time and helped to promote economic growth in the region.

3. In 1862, during the American Civil War, the Battle of Glendale was fought on June 30 near Richmond, Virginia. The battle was part of the Seven Days Battles and resulted in Confederate victory, although both sides suffered heavy casualties.

4. On June 30, 1908, The Virginia Company of London was reorganized as the Virginia Company of New York. The Virginia Company was responsible for establishing the first permanent English settlement in North America at Jamestown in 1607, and it played a significant role in the early colonial history of the United States.

5. In 1985, on June 30, Marvel Comics published the first issue of "Crisis on Infinite Earths," a comic book series that radically transformed the DC Comics universe. The series was written by Marv Wolfman and illustrated by George Pérez, and it is considered one of the most important events in comics history.