West Francia was a historical region in medieval Europe that emerged after the division of the Carolingian Empire in the late 9th century. It roughly corresponds to modern-day France and was established following the Treaty of Verdun in 843. The region was characterized by a feudal system, with local lords holding power over their territories. The kingdom of West Francia faced numerous challenges, including Viking invasions and internal conflicts among noble families. Over time, it evolved into a more centralized state, eventually leading to the formation of the Kingdom of France in the 10th century under the Capetian dynasty.