Monopolies to Break Up?

[Bacon King]

Sirius XM monopoly of satellite radio
Fair Isaac monopoly of credit scoring services
Monsanto monopoly of herbicides and seeds and such
Clear Channel near-monopoly of domestic FM radio

oligopoly of movie studios
oligopoly control of TV, internet, and media
oligopoly of cell phone service providers

[Bacon King]

Also airlines, intercity bus travel (Greyhound), oil companies, and retail (Walmart).

I don't understand why the states don't break up monopolies. There's 50 states, and not a single one is breaking up monopolies?

You realize that monopolies generally cross state lines, and therefore an individual state would have little power to do anything about it, right?

Then what's the point of even having states?

Some of these companies cross national lines too, but it used to be that this didn't stop the federal government from regulating them.

The Congress shall have Power ... To regulate Commerce with foreign Nations, and among the several States, and with the Indian Tribes