Why is an area marked in hatch lines on the 1763 map but not on the 1783 map?

The area marked in hatch lines on the 1763 map likely indicates a region of interest, such as disputed territory or land under consideration for settlement or governance. By the time of the 1783 map, changes in political boundaries, treaties, or land agreements, such as the Treaty of Paris ending the American Revolutionary War, may have resolved the status of that area, leading to its removal from the later map. The absence of hatch lines could signify that the land was no longer in question or had been officially incorporated into a recognized jurisdiction.