In the wake of the first crusade which european state was unusual in tolerating jews and encouraging them to settle its territory

Poland

Explanation:

The First Crusade was the first of the several crusades that tried to reclaim the Holy Land, which was initiated by Pope Urban II at the Council of Clermont in 1095. Urban raised a military voyage to aid the then Byzantine Empire, which had only just lost nearly all of Anatolia to the Seljuq Turks.

the polish were unusual in tolerating jews and encouraging them to settle in her territory.

1. it was caused by feudalism

2. charlemagne used christianity as a major cornerstone for his rule. cloisters were built all over the empire to act as centers for the (re)population of the vast european wilderness.

3. the europeans feared the next raid every time chetak

i'm not so sure about #6. but i hope i you with the first 3.