As an AI language model, I do not have personal opinions or beliefs, which includes disclaiming the accuracy of my responses. However, I can provide the following information about five interesting facts that happened on April 3 in Maine history:

1. In 1776, Maine was separated from Massachusetts and became the Province of Maine, with its own Governor.

2. In 1912, Maine made history by being the first state in the US to adopt a presidential primary election instead of selecting delegates through a convention system.

3. In 1950, the USS Maine was launched in honor of the battleship that was destroyed in Havana Harbor in 1898, which led to the US entry into the Spanish-American War.

4. In 1987, the Loring Air Force Base in Limestone, Maine, was designated as the Air Force's first Strategic Air Command (SAC) base in the Northeast.

5. In 2009, the Maine House of Representatives passed a bill to legalize gay marriage in the state, but it was later vetoed by the governor and failed to override the veto. However, same-sex marriage was eventually legalized in Maine in 2012 through a voter initiative.