What primarily set off large-scale migration flows among European countries during the twentieth century? A. the ability to establish distinctive political structures
B. the familiar cultural traditions of the host countries
C. the motivation to reach quotas set by individual countries
D. the desire to reunite with family members who migrated previously
E. the removal of migration restrictions

C

Explanation:

the motivation to reach quotas set by individual countries

answer:

the crusades were organized by western european christians after centuries of muslim wars of expansion. their primary objectives were to stop the expansion of muslim states, to reclaim for christianity the holy land in the middle east, and to recapture territories that had formerly been christian.

explanation:

you can literally google this.