If it weren't for a large portion of the American public having religious motivation (evangelical protestantism) to support Israel unconditionally, no matter what, then the US would be able to exert considerable pressure on Israel, for instance by threatening to cut off Israel as Israel has been cutting off Gaza. No more arms shipments, no more UN Security Council vetos of any anti-Israel resolution, etc.
But of course this is politically impossible for the US. Near half of the US population would throw an absolute fit.
But of course this is politically impossible for the US. Near half of the US population would throw an absolute fit.