How come so many people in the U.S. have Jewish ancestors?

It seems to me that many white American celebrities are of Ashkenazi Jewish ancestry, including Natalie Portman, Carrie Fisher, Scarlett Johansson, Mila Kunis, Gal Gadot, Jeff Goldblum, Harrison Ford... Do they have any connection with their roots today and is there any historical explanation for their high... show more It seems to me that many white American celebrities are of Ashkenazi Jewish ancestry, including Natalie Portman, Carrie Fisher, Scarlett Johansson, Mila Kunis, Gal Gadot, Jeff Goldblum, Harrison Ford...

Do they have any connection with their roots today and is there any historical explanation for their high numbers in the U.S?
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