A joint display of New Jersey’s two “birth certificates” is highlighting an observance of the 345th anniversary of the state’s founding as a British proprietary colony. One of the documents is the June 24, 1664 Royal Grant issued by King Charles II’s brother James, Duke of York, establishing an English colony called New Jersey. The other is an original copy of the Declaration of Independence printed on July 4, 1776. Both will remain on display at the State Museum in Trenton through 3 p.m. Thursday. New Jersey earned the opportunity to display the rare copy of the Declaration thanks to the widespread participation of Garden State students in voter education and mock election activities last fall. AP.