Why did the Roman Emperor Hadrian expel the Jews from Palestine? A)The Jews would not convert to Christianity.
B)The Arabs had attacked the Jews.
C)The Jews had started a revolt.
D)The United Nations had ordered the Jews expelled

The Jews had started a revolt.

Explanation:

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.