More importantly, one can observe that America (and indeed the entire West) has been steadily moving to the Left since long before the Jews had significant influence. For example, the emancipation of black slaves in the 1860s followed by the original civil rights legislation; giving girls the right to vote which culminated in 1920 but was the result of a large movement for many years earlier; and so on.
The anti-Semites would have us believe that whatever process was moving the West to the left magically stopped in 1950 and after that it was the Jews. Of course this goes against common sense and Occam’s Razor, which says that it’s been the same process the whole time.
Thank you, Fortaleza84!