Lets refer to the map! 8)
(http://vignette1.wikia.nocookie.net/gunsoficarusonline/images/2/27/Guns_of_Icarus_Map.jpg/revision/latest?cb=20140314035859)
Chaladonians:
We know that the chaladonians are a very sophisticated and intelligent faction. The Gas Mortar is thought to be a mistake from making a fertilizer or pesticide. We can also see from the map that their influence on the land has made it very prosperous thus vegetation can seen. We also know that the Order do not share their secrets with other factions due to the state of the world with continued erosion.
Arashi:
We know that the Arashi live on the dunes of the great Arashi Desert. This is an environment only for the fittest. A fitting statement of the League. Food is scarce and the league most likely scavenge for food. Being so close to the bountiful mercantiles and the empire of Yesha, Arashi's have a plentiful haven of trade routes to explore and pillage.
Yesha:
Little is known about the great empire of yesha. It is known everyone has their place within the empire - Farmer, Mercenary and so on. In regard to this, we can also see areas of vegetation in the highlands of the rusted range. There are also lakes which can be utilised for maintaining the farmland. This leads me to believe the Yeshan Empire is somewhat self resourceful in providing food however, the Yeshan Empire is very large. This may require the yeshans to trade in order to feed everyone. An action which is dangerous with Arashi and Angleans lurking.
Anglean:
Similar to arashi, only the toughest and most resourceful can survive in the sub zero temperatures of the Anglea. In such cold climates, Farming is near impossible and thus, hunting is a likely source of food however. We forget that the Angleans are masters of knowlege of the past. They are known to dig deep into the ice to discover the wonders of old. Some have even made these areas home. It would be no surprise to suspect that Angleans can utilise old technology for purposes such as heat. A valuable resource for cooking, living, farming and melting. Arashi are constantly under pressure to find water. Anglean's have an unlimited supply.
Baronies:
Wealthy, tactical and observant, the baronites are by no means without food. By the creed, everyone is thought to be catered for however, there are signs of shortages. King Gregor's influence is fading. As a formidable opponent and wealthy empire, the baronites are capable of trading for resources in exchange for mercenaries, weapons and knowledge of war.
Mercantiles:
Mercantiles live in the arid plains of the vastness. very little life exists here. It is by no means as bad as the Arashi Desert but little can survive here. Despite this, the mercantiles make a living through trade. The Vastness is home to a great wealth of minerals. Jewelry, crystals and other wonders are all collected here by the mercantiles making them are very wealthy ally. With enough resources for trade and survival, the mercantiles can trade for food in exchange for lenses and other minerals.