Final answer:
The historical similarity between the taxation and warrior systems of Medieval Europe is the use of taxation to support military efforts, with warriors often exempt from taxes, receiving land or compensation instead.
Step-by-step explanation:
The historical similarities between the taxation and warrior systems of Medieval Europe can be most closely associated with the way taxation was used to support military efforts. In feudal systems, lords and monarchies needed to protect their territories and maintain their power, often requiring resources that were partially provided through taxation. Taxation served various purposes, including funding military expeditions such as the Crusades, maintaining the fighting forces, and sometimes providing directly for the needs of warriors in the form of land or other compensation. Furthermore, under the feudal system, warriors, or vassals, were typically exempt from paying taxes because they provided military service in lieu of taxation. Peasants were the primary source of tax revenue, which were typically in the form of labor, goods, or coin. The Church, an influential and powerful entity in medieval society, often had its lands declared tax-exempt.