As title says-which areas of North America that are not cultivated today could be turned into farmland? Pre-Columbian agriculture in colder parts of N. America was limited by the fact, that native crops were not particulary good adapted to cooler climates (like maize). European settlers OTOH had enough land available to ignore marginal lands, which in Old World's conditions could be used for agriculture due to greater population pressure. So what areas would be used as farmland if either Natives get cold adapted crops somehow (like barley or buckwheat) or there is enough population pressure among European settlers to move into these unpromising lands? @Jürgen once compared Newfoundland to Central Scandinavia in terms of soil and climate (which is land hardly perfect for farming, but still was and is cultivated)-big difference is day lenght during growing season: long days of Scandinavian summers improves conditions for crops to grow. What about coastal British Columbia and Southern Alaska? It is mountainous and rainy area, but western Norway is too, is there something in BC that makes it impossible to be America's Norway analogue? Any other suggestions?