Americans have from the founding been influenced by a (largely Protestant) religious ethos which reveres the Old Testament (Torah) as much as the New. You can see the respect for the Jews in the writings of the Founding Fathers such as Washington and Franklin. How much that had to do with their Masonic beliefs and teachings is another interesting question.
But here in America, with notable exceptions like Pat Buchanan, and the raving nutcase Aryan Brotherhood, KKK, etc,. it is mostly the left (leftist Jews included) that is anti-Israel and the non-Jews among them tend to be virulently anti-semitic in turn.
Ain't that the truth. I recall how during the 1960's and 1970'S, many liberals and leftists who opposed the Vietnam war supported Israel.