There are many differences among American Jews and Israeli Jews.
In the United States, the majority of Jews are Ashkenazi (though
there are some Sephardic Jews). Also, American Jews often make
specific distinctions between Reform, Conservative, Secular
Humanist, Reconstructionist, and Orthodox, whereas in Israel,
people tend to be secular Jews, reform, or Orthodox. In the U.S.,
Jews have to make an effort to celebrate the holidays or go to
services, but in Israel the holidays are essentially automatically
in the calendar, and Judaism is kind of all around. Some American
Jews know few other Jews, but the majority of Israeli Jews know
lots of other Jews.