Pervasive corruption in modern America has been thoroughly documented.
Jon Schwarz has rounded up a good collection of recent quotes on corruption from both sides of the aisle:
• “Now [the United States is] just an oligarchy, with unlimited political bribery being the essence of getting the nominations for president or to elect the president. And the same thing applies to governors and U.S. senators and congressmembers. … So now we’ve just seen a complete subversion of our political system as a payoff to major contributors …” — Jimmy Carter, former president, in 2015.