Who is in charge of upholding the supremacy clause of the united states constitution

Which of the following factors would be a likely reason for low population density

Characteristics of what type of economic system are being described below? 1.economy in which some/all of the basic economic questions answered by central authority 2.trade generally limited to what is produced through the influence of the government a.command economies. b.market economies. c.traditional economies.

Which of these is an edge city? boston, ma chicago, il irvine, ca detroit, mi