OK but you said the USA is the *most* corrupt country in the world. Meaning if there is even *one* country more corrupt, the US isn't the most corrupt. Why is the US more corrupt than India or Russia for example?
My answer is that in those two countries, bribing legislators is illegal, while enforcement is poor.
In the US, it's all been made legal, so happens on a massive scale right out in the open.
In India a small businessman gets annoyed that he has to pay a $20 bribe to have an operating license issued, but it works. In the US there is no bribe he can pay to make his business work because the multinational billion dollar corporation with offices on Wall Street, D.C, and every other major city has paid off the legislators and had them introduce laws that introduce a barrier to entry that no small business could ever scale.
opensecrets.org