1. On April 19, 1775, the first shots of the American Revolution were fired in Lexington and Concord, Massachusetts, but this event also had a significant impact on Maine. Many Maine soldiers fought in the Revolutionary War, including the Penobscot Expedition in 1779.

2. On April 19, 1824, Maine became the 23rd state to join the United States. The state was previously a part of Massachusetts until it became its own entity.

3. In the early morning of April 19, 1863, a Confederate raid on Portland, Maine took place. The raid was intended to destroy Union ships and supplies, but it was ultimately unsuccessful.

4. April 19, 1913 saw the opening of the Roosevelt International Bridge, which connects the towns of Lubec, Maine and Campobello Island, Canada. This unique bridge is the only one in the world that connects two international parks.

5. On April 19, 1975, the fishing vessel "Regulus" sank off the coast of Maine. The crew was rescued by the Coast Guard, but the sinking sparked a controversy over the safety regulations of fishing vessels. This event ultimately led to the creation of the Fishing Vessel Safety Act of 1988, which established new safety standards for fishing vessels in the United States.