Bloodies battle is: battle of Sharpsburgh
The treaty of paris of 1783
Laws would vary from one State to the other, which would make it difficult to adhere to if you're not from that State. Also, politics would play into effect. I'd like to use the American Civil War as an example; some states were for Slavery, meanwhile others sided on the abolishment side. That could come into play here, and that could be extremely dangerous.
Economics is the study of money output and input. So it would have to be A). The production,distribution and consumption of goods. Or B) because supply and demand is important in economics