One of the great things about studying history is that there is always something new to discover, simply by asking a different question. As I work on a fictionalized account of historical events, I find myself asking very specific questions that I would not have asked otherwise. For example, it's generally known that German immigrants in the 1740s would most likely arrive at Philadelphia, but what was that experience really like? If you put yourself in their position, what were the logistical details of arrival?
I had casually assumed that everyone disembarked as soon as the ship docked, and that the ship would dock as soon as it arrived. The truth is far more complex.