Killed an entire continent of peoples and enslaved millions of people from another one to make agricultural commodities.

Also during ww2 the US refused a ship of jews fleeing nazi germany and made them return.

They also won't make anti-semitism illegal cause freeze peach, so US cops often protect white supremacist groups during protests from righteously outraged ppl. US cops also often recruit directly from those groups, and use them to carry out illegal things actions they don't want to be responsible for. There isn't enough space here to even get into the US's anti-semitic past.

https://en.wikipedia.org/wiki/Native_American_genocide_in_the_United_States - 4+ million Native Americans killed in a time when overall populations where much lower. If that number were scaled to the 20th century population it would be an order of magnitude higher.

At once, in a assembly way or specifically targeting Jewish people?

Plus it's not like they were cool with those trying to escape Germany. And chance would have sided with Germany if Britain had fallen.

https://www.pbs.org/wnet/exploring-hate/2022/03/14/today-in-history-antisemitism-an-american-problem/