Why did prejudice against Jews increase in the late 1000s?

Many medieval Christians were suspicious of Jewish culture and practices.

Explanation:

Jewish leaders wanted more control of government. Christian leaders believed that Jewish leaders were competing with them in an effort to win converts to their religions.

the causes of the dust bowls were severe droughts,   lands became dry and hard, temperature was higher than usual, hot and dry conditions killed crops, high winds. because of those factors, the winds kicked up dry soil and created clouds of dust.