How does one make sure a country as vast as the United States stays compliant with the whims of the folks in Washington, DC? Easy, make sure the hinterlands are reliant on federal outlays.
Plan on thinking for yourself state X? You might want to think again or we’ll pull your funding. And you wouldn’t like that now would you? Lots of people would be unhappy. You guys in state government might get thrown out of office.
Just be smart and do what we say in Washington and things will go much more smoothly.