In the case of Zacharias Long from PA, I assume that they have found a birth certificate. There are many family trees about Zacharias on Ancestry, but no one in showing such a certificate. Why?
Zacharias Lange came from Germany with the Brunswick Regiment and was garrisoned in Quebec in 1776. He later deserted his regiment like many other mercenaries and traveled to Philadelphia where he became an American citizen and, later, an American Patriot.