Shield as terrain type is iffy -- I'm just saying that "rocky terrain" needs to be noted. NWFLD being a huge green plain just highlighted that: that would make it kick ass high-population farming, when in reality most of it is a very marginal place to build, with most of the food coming via fishing not farming. I guess you could make most of it tundra, and have lots of fish off the coast... (The grand banks of NWFLD is some of the best fishing grounds in the entire world) ... The importation of the potatoe was of huge strategic importance. It grows very well at high climate levels, and is surprisingly nutritious. It was probably key in turning the UK into a world power by changing the island from a food importer to a food exporter... Other root veggies are less important.