That one is way, way out of date. These days, American Jews are as American as apple pie, and identify themselves as American, first and foremost, and are viewed that way. At least that is my perception.
Jew hatred is at a very low ebb on the fruited plain these days. America just keeps getting better, and better. JMO.
But it does raise an interesting point as pertains to the Holocaust. In Denmark, the Danish Jews were almost all saved by their fellow Danes. Now there are many reasons for this including the warning that the Nazi's were planning a roundup and the generally benign way that the Danes were treated by the Nazis ( who considered them to be Aryan brothers who merely needed a bit of time to come around) but another explanation is that the Danes as a whole did not view the jews living in Denmark to be Danish Jews but rather Danes who happened to be jewish.
Many jews worry about the lack of "jewishness" in American jews. Lapsed faith and intermarriage is killing judaism in this country. There are alot of jews in this country who are as "religious" as easter and christmas christians.
Low birth numbers are lowering jewish identity right now in the US as well. Successful people tend to have less children. Same thing of course is going on in Japan, Ireland as well.
I think there are some Jews who worry about the very success of assimilation. Too American, not Jewish enough, intermarrying, secularizing, etc. BTW it is also true that Jews were largely and successfully assimilated into the German community in the 1930's. One reason they responded slowly and incredulously to the gathering storm of nazism.
Nevertheless, one reason for the history of "jew-hatred," even though it may not be unique, may be this: that to the degree that the Jewish community retains an identifiable measure of separateness, they will be easy to mark as what the paperback sociologists like to call "the Other," a target for the projection of the host society's ills.