Although the Crusades illustrated a new spirit of adventure among European kings, princes, and knights, when analyzed in their entirety, the Crusades were hardly a total success. If anything, the Crusades hardened the sense of "holy war" between the Christian west and Islamic east.
The political, economic, and military institution known as feudalism slowly developed in the High Middle Ages as an attempt to bring some order to the politically fragmented world of medieval Europe. At the same time, new national monarchies emerged in England, France, Germany, and Spain; they owed their success to citizen participation and loyalty. One could make the bold claim that perhaps the modern nation-state was born during the High Middle