Who actually built it? Who, in the US, built it? You’ll be surprised at how much of a distraction “states” are in understanding International action. The same people who set up Israel set up the post-WWII institutions. They have been the greatest beneficiaries of that order and don’t care about nations or states or those categories. What matters is they benefit from as much of human labour as possible.
The US government and billionares and millions of our citizens who donated time and money and swayed the public and multiple countries towards this status quo are each as guilty as any(nevermind those who moved to Israel and helped seed and prop-up the regime in power there today). Accepting blame does not mean that others aren’t also to blame, but blame-shifting is ignorant and apathetic, at best.