They had to live in one of the hardest places to farm, and back then, if you had a poor crop harvest, you would starve.
The Norse civilization should be number 1. The Norse people were Germanic people who settled in Scandinavia. They had to live in one of the hardest places to farm, and back then, if you had a poor crop harvest, you would starve. But they got past that by raiding and trading with other European settlements to get food.