Related but more broad question: Why is such a large percentage of Jewish population worldwide in USA
According to Wikipedia, the United States has a higher proportion of Jews than Canada, Australia and New Zealand.
All of these countries have a very large proportion of people descended from people who immigrated in the past couple of centuries. All have a plurality or even majority of Europeans plus people descended from Europeans. All have had prejudice against Jews and Europeans from countries outside of the western part of Europe (I'm not using "Western Europe" as these prejudices pre-date the Iron Curtain), and government actions that reflected those prejudices.