Each state has its own rules for which vaccines kids must have to attend school and the reasons students can opt out.
Federal authorities have input, but states reign supreme – unless they decide to let local governments make the call.
The 6-3 ruling challenges some common political assumptions about conservatives and liberals.
Distrusting large federal bureaucracies isn't reserved for conservatives anymore.
The attorney general's memo portended an end to a hands-off approach to this enforcement conundrum. It could backfire.
The new rules Kentucky and other states want to impose could leave millions of Americans who benefit from this safety net program uninsured – and resorting to the emergency room for their health care.
New York, California and other high-tax states are angling to use the charitable deduction and state payroll taxes as workarounds to shield both their residents and their revenue.
A new federalism? Trump's decision to green-light the Dakota Access Pipeline and early battles with states show a disregard for the sovereignty of domestic government bodies.
States once used their constitutional authority to argue in defense of slavery. Today, states can make a similar argument to protect immigrants from deportation, writes a legal scholar.