This depends on what you mean by 'white.'. In the sense of not being required to prove their Freedom or face reenslavement, in the sense of being able to vote, Jews were 'white' and not 'black'. But the housing covenants that prevented Jews from buying houses were not declared illegal until 1948 in Shelley vs Kramer.
http://supreme.justia.com/cases/federal/us/334/1/case.html This is just one example of a sort if anti-jewish discrimination that was legal into the 20th century.

But really I think that the question is too cut and dry. Jews were discriminated against not just on racial grounds but (more so) on religious grounds. And Jews were, like Irish Americans and Italians and Slavs, eager to claim that they were white people with the privileges that entailed. It was always a very different situation from that of African Americans.