Lists by Candylyn
Part One: Lex would use his financial power to crash the world economy; using people's fear and desperation to rise to President of the US. Once in office things "mystically" become better in the US only.
Part Two: He works with the villians to deface the image of the heroes; framing them for harming or killing civilians during a fight with the villians or something. The heroes are then looked upon as dangerous.
Lex, backed by the public, pushes congress to pass a law that outlaws the work done by the heroes. However enforcing this law means creating a state under a pseudo-martial state. It works the heroes are either arrested or go into hiding. However, now the US is under martial law for its own protection. The people stay quiet because they have "bread and circus" (good paying jobs and all the reality tv they can watch) to keep them quiet.
Other countries essentially turn to Lex for help and he is eventually crowned a sort of "King" by the UN. He now has complete power. This was the plan all along.
Part Three: His tyrantical leadership is more than the world can handle. Still, people do little to stop him as they are comfortable as long as they do nothing against him. Humans, like Amanda Waller, free the heroes to deal with him and his minions.