Historically, a good rule of thumb is that the level of specialization of any trade related directly to its setting. More urban areas with a greater supply of workers required trades to specialize. Rural areas had a smaller supply of skilled labor, therefore the skilled workers who were there had to generalize and broaden their offerings to make money. An ironworker in a city might just shoe horses, or just make nails, or just make a certain type of tool. Lots of consumers meant shops had to pick an area and excel at it to secure that end of the market. Meanwhile, in the country blacksmith shops consumers had fewer options for skilled labor, and a country smith needed to be able to address a broad range of demands to make a living, Thus, the typical rural American smith had to be able to do a little of everything, shoeing horses, repairing tools, fixing farm equipment, maybe even working with wheels and wagons. Likewise in the woodworking trades the city woodworkers might be divided into joiners, framers, cabinetmakers, etc. who specialized in one aspect. "Country Carpenters" did a little of everything to make a living