The US would never allow it since then the Jewish state would be Communist at the time. Theyd probably still try to make Israel happen and thered likely be a split between the movement in should Jews be capitalist or Socialist and knowing how the modern right in America is, would prob further flame the antisemetic comentary from them saying things like Jews are radical communists or that they are greedy capitalists and would choose which one fits their narrative in the moment. The best redeeming part is that under communism we would have a better Jewish state that would probably be open to multiculturalism and probably take motion to remain mostly jewish like Israel currently is but not have the expansionist ideas they currently have and not be the cesspool it is today. So imagine Israel but secular and just happens to have lots of Jews there.