Provide evidence from the 1990s to the present of the conflict between the national and state goverment. Focus on federal aid to the states.

In modern times, many of the disputes over federalism have
to do with how many "strings" the federal government can and should attach to the money
it gives to the states.  We can see this in, for example, debates over Medicaid and over
the No Child Left Behind law.

In both cases, the federal
government gives a great deal of aid to states.  In both cases, it sets out many rules
by which the states must play in order to get that money.  By doing so, the federal
government exerts tremendous power over areas that the states feel they should control. 
Because of this, the states have tried hard to get out of having to obey the rules set
by the national government.  This process is ongoing today as people like Governor Perry
of Texas want waivers of Medicaid provisions and states like Utah consider opting out of
federal funding to avoid having to follow NCLB.