During the period of the crusades, warfare between christians and muslims lasted nearly
years

200years

Explanation:

During the period of the Crusades, warfare between Christians and Muslims lasted nearly 200 years.

The Crusades were a series of military campaigns promoted by the Pope and carried out by a large part of Christian Latin Europe, mainly by the France of the Capetians and the Holy Roman Empire. The Crusades, with the initial specific objective of restoring Catholic control over the Holy Land, were fought over a period of almost two hundred years, between 1096 and 1291. Later, other campaigns in Spain and Eastern Europe, some of which they did not see its end until the fifteenth century, received the same denomination. The Crusades were held mainly against the Muslims, but also against the pagan Slavs, Jews, Greek and Russian Orthodox Christians, Mongols, Cathars, Hussites, Waldenses, Prussians (or Prussians), Lithuanians (in general against the Baltic peoples) and against enemies politicians of the Popes.

so they can differentiate themselves from others as they saw themselves as the superior race. the star was basically a symbol that meant you are a less of a person than i am because of my race. the star was also degrading for those who had to wear it because they were aware of this and the nazis used the notion to make them feel less like a person.