How did the word "ghetto" become a word use to describe black people, can any other race be "ghetto"?

First of all, ghetto was the term use during the holocaust where Jews were compelled to live. It later became known as an area of a city where minorities of the same ethnic group live together. But today, it is use to describe someone who is loud, obnoxious, ignorant, uneducated...etc. So how exactly did the... show more First of all, ghetto was the term use during the holocaust where Jews were compelled to live. It later became known as an area of a city where minorities of the same ethnic group live together.

But today, it is use to describe someone who is loud, obnoxious, ignorant, uneducated...etc.
So how exactly did the meaning of the word switch from an "area" to to black people?
and if another race (any) is loud, obnoxious, ignorant etc.. are they ghetto too? or is it just for black people?
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